216755904 has 28 divisors (see below), whose sum is σ = 573500504. Its totient is φ = 72251904.

The previous prime is 216755897. The next prime is 216755923. The reversal of 216755904 is 409557612.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 564277 + ... + 564660.

Almost surely, 2^216755904 is an apocalyptic number.

216755904 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

216755904 is an abundant number, since it is smaller than the sum of its proper divisors (356744600).

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

216755904 is a wasteful number, since it uses less digits than its factorization.

216755904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1128952 (or 1128942 counting only the distinct ones).

The product of its (nonzero) digits is 75600, while the sum is 39.

The square root of 216755904 is about 14722.6323733224. The cubic root of 216755904 is about 600.6990962355.

The spelling of 216755904 in words is "two hundred sixteen million, seven hundred fifty-five thousand, nine hundred four".