213904656 has 60 divisors (see below), whose sum is σ = 684158592. Its totient is φ = 61115328.

The previous prime is 213904651. The next prime is 213904687. The reversal of 213904656 is 656409312.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 213904656.

It is not an unprimeable number, because it can be changed into a prime (213904651) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 105096 + ... + 107111.

Almost surely, 2^213904656 is an apocalyptic number.

It is an amenable number.

213904656 is an abundant number, since it is smaller than the sum of its proper divisors (470253936).

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

213904656 is a wasteful number, since it uses less digits than its factorization.

213904656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212228 (or 212219 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

The square root of 213904656 is about 14625.4796844411. The cubic root of 213904656 is about 598.0535591079.

The spelling of 213904656 in words is "two hundred thirteen million, nine hundred four thousand, six hundred fifty-six".