216860864 has 28 divisors (see below), whose sum is σ = 469456008. Its totient is φ = 98572800.

The previous prime is 216860821. The next prime is 216860873. The reversal of 216860864 is 468068612.

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 3 ways as a sum of consecutive naturals, for example, 153317 + ... + 154724.

It is an arithmetic number, because the mean of its divisors is an integer number (16766286).

Almost surely, 2^216860864 is an apocalyptic number.

It is an amenable number.

216860864 is an abundant number, since it is smaller than the sum of its proper divisors (252595144).

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

216860864 is a wasteful number, since it uses less digits than its factorization.

216860864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 308064 (or 308054 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 41.

The square root of 216860864 is about 14726.1965218450. The cubic root of 216860864 is about 600.7960396972.

The spelling of 216860864 in words is "two hundred sixteen million, eight hundred sixty thousand, eight hundred sixty-four".