216004656 has 40 divisors (see below), whose sum is σ = 637729024. Its totient is φ = 61715520.

The previous prime is 216004643. The next prime is 216004727. The reversal of 216004656 is 656400612.

It is a super-2 number, since 2×216004656² = 93316022827356672, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 321100 + ... + 321771.

Almost surely, 2^216004656 is an apocalyptic number.

It is an amenable number.

216004656 is an abundant number, since it is smaller than the sum of its proper divisors (421724368).

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

216004656 is a wasteful number, since it uses less digits than its factorization.

216004656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 642889 (or 642883 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 216004656 is about 14697.0968561822. The cubic root of 216004656 is about 600.0043110801.

The spelling of 216004656 in words is "two hundred sixteen million, four thousand, six hundred fifty-six".