216905004 has 36 divisors (see below), whose sum is σ = 557586120. Its totient is φ = 71075520.

The previous prime is 216904999. The next prime is 216905011. The reversal of 216905004 is 400509612.

It is a tau number, because it is divible by the number of its divisors (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 48937 + ... + 53184.

Almost surely, 2^216905004 is an apocalyptic number.

It is an amenable number.

216905004 is an abundant number, since it is smaller than the sum of its proper divisors (340681116).

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

216905004 is a wasteful number, since it uses less digits than its factorization.

216905004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102190 (or 102185 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 216905004 is about 14727.6951353564. The cubic root of 216905004 is about 600.8367990696.

The spelling of 216905004 in words is "two hundred sixteen million, nine hundred five thousand, four".