216015720 has 64 divisors (see below), whose sum is σ = 654376320. Its totient is φ = 57041664.

The previous prime is 216015707. The next prime is 216015733. The reversal of 216015720 is 27510612.

It is an interprime number because it is at equal distance from previous prime (216015707) and next prime (216015733).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3622 + ... + 21098.

It is an arithmetic number, because the mean of its divisors is an integer number (10224630).

Almost surely, 2^216015720 is an apocalyptic number.

216015720 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 216015720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (327188160).

216015720 is an abundant number, since it is smaller than the sum of its proper divisors (438360600).

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

216015720 is a wasteful number, since it uses less digits than its factorization.

216015720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17594 (or 17590 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 24.

The square root of 216015720 is about 14697.4732522294. The cubic root of 216015720 is about 600.0145552025.

The spelling of 216015720 in words is "two hundred sixteen million, fifteen thousand, seven hundred twenty".