256634208 has 36 divisors (see below), whose sum is σ = 729804348. Its totient is φ = 85544640.

The previous prime is 256634179. The next prime is 256634219. The reversal of 256634208 is 802436652.

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

It is a super-2 number, since 2×256634208² = 131722233431574528, which contains 22 as substring.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 445258 + ... + 445833.

It is an arithmetic number, because the mean of its divisors is an integer number (20272343).

Almost surely, 2^256634208 is an apocalyptic number.

It is an amenable number.

256634208 is an abundant number, since it is smaller than the sum of its proper divisors (473170140).

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

256634208 is a wasteful number, since it uses less digits than its factorization.

256634208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 891107 (or 891096 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 36.

The square root of 256634208 is about 16019.8067404073. The cubic root of 256634208 is about 635.4843334066.

The spelling of 256634208 in words is "two hundred fifty-six million, six hundred thirty-four thousand, two hundred eight".