256478109696 has 392 divisors, whose sum is σ = 781731359064. Its totient is φ = 84085309440.

The previous prime is 256478109683. The next prime is 256478109757. The reversal of 256478109696 is 696901874652.

256478109696 is a `hidden beast` number, since 2 + 56 + 478 + 109 + 6 + 9 + 6 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 400121536 + ... + 400122176.

Almost surely, 2^256478109696 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 256478109696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (390865679532).

256478109696 is an abundant number, since it is smaller than the sum of its proper divisors (525253249368).

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

256478109696 is an frugal number, since it uses more digits than its factorization.

256478109696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 752 (or 713 counting only the distinct ones).

The product of its (nonzero) digits is 39191040, while the sum is 63.

The spelling of 256478109696 in words is "two hundred fifty-six billion, four hundred seventy-eight million, one hundred nine thousand, six hundred ninety-six".