256840228032 has 56 divisors (see below), whose sum is σ = 679689101376. Its totient is φ = 85596695808.

The previous prime is 256840228009. The next prime is 256840228061. The reversal of 256840228032 is 230822048652.

It is a happy number.

It is a super-3 number, since 3×256840228032³ (a number of 35 digits) contains 333 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, 875623 + ... + 1131545.

Almost surely, 2^256840228032 is an apocalyptic number.

It is an amenable number.

256840228032 is an abundant number, since it is smaller than the sum of its proper divisors (422848873344).

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

256840228032 is a wasteful number, since it uses less digits than its factorization.

256840228032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 261165 (or 261155 counting only the distinct ones).

The product of its (nonzero) digits is 368640, while the sum is 42.

The spelling of 256840228032 in words is "two hundred fifty-six billion, eight hundred forty million, two hundred twenty-eight thousand, thirty-two".