213646856 has 16 divisors (see below), whose sum is σ = 403141740. Its totient is φ = 106142400.

The previous prime is 213646841. The next prime is 213646877. The reversal of 213646856 is 658646312.

It can be written as a sum of positive squares in 2 ways, for example, as 195720100 + 17926756 = 13990^2 + 4234^2 .

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, 83795 + ... + 86306.

Almost surely, 2^213646856 is an apocalyptic number.

It is an amenable number.

213646856 is a deficient number, since it is larger than the sum of its proper divisors (189494884).

213646856 is a wasteful number, since it uses less digits than its factorization.

213646856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170264 (or 170260 counting only the distinct ones).

The product of its digits is 207360, while the sum is 41.

The square root of 213646856 is about 14616.6636412008. The cubic root of 213646856 is about 597.8132025070.

The spelling of 213646856 in words is "two hundred thirteen million, six hundred forty-six thousand, eight hundred fifty-six".