216389056 has 56 divisors (see below), whose sum is σ = 489661200. Its totient is φ = 93990912.

The previous prime is 216389053. The next prime is 216389071. The reversal of 216389056 is 650983612.

216389056 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×216389056² = 93648447113142272, which contains 22 as substring.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216389053) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6495 + ... + 21793.

It is an arithmetic number, because the mean of its divisors is an integer number (8743950).

Almost surely, 2^216389056 is an apocalyptic number.

216389056 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 216389056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (244830600).

216389056 is an abundant number, since it is smaller than the sum of its proper divisors (273272144).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

216389056 is a wasteful number, since it uses less digits than its factorization.

216389056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15341 (or 15331 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 40.

The square root of 216389056 is about 14710.1684558675. The cubic root of 216389056 is about 600.3600209687.

It can be divided in two parts, 2163 and 89056, that added together give a palindrome (91219).

The spelling of 216389056 in words is "two hundred sixteen million, three hundred eighty-nine thousand, fifty-six".