216426540 has 96 divisors (see below), whose sum is σ = 675247104. Its totient is φ = 51343360.

The previous prime is 216426503. The next prime is 216426557. The reversal of 216426540 is 45624612.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 216426498 and 216426507.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 27532 + ... + 34508.

It is an arithmetic number, because the mean of its divisors is an integer number (7033824).

Almost surely, 2^216426540 is an apocalyptic number.

216426540 is a gapful number since it is divisible by the number (20) 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 216426540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (337623552).

216426540 is an abundant number, since it is smaller than the sum of its proper divisors (458820564).

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

216426540 is a wasteful number, since it uses less digits than its factorization.

216426540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7047 (or 7045 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 30.

The square root of 216426540 is about 14711.4424853581. The cubic root of 216426540 is about 600.3946847607.

It can be divided in two parts, 21642 and 6540, that added together give a palindrome (28182).

The spelling of 216426540 in words is "two hundred sixteen million, four hundred twenty-six thousand, five hundred forty".