216236520 has 128 divisors (see below), whose sum is σ = 724118400. Its totient is φ = 57397248.

The previous prime is 216236513. The next prime is 216236533. The reversal of 216236520 is 25632612.

216236520 is a `hidden beast` number, since 2 + 1 + 6 + 2 + 3 + 652 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

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, 374472 + ... + 375048.

It is an arithmetic number, because the mean of its divisors is an integer number (5657175).

Almost surely, 2^216236520 is an apocalyptic number.

216236520 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 216236520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (362059200).

216236520 is an abundant number, since it is smaller than the sum of its proper divisors (507881880).

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

216236520 is a wasteful number, since it uses less digits than its factorization.

216236520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 944 (or 934 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 216236520 is about 14704.9828289597. The cubic root of 216236520 is about 600.2189201136.

The spelling of 216236520 in words is "two hundred sixteen million, two hundred thirty-six thousand, five hundred twenty".