256704756620 has 48 divisors (see below), whose sum is σ = 580685312928. Its totient is φ = 94760824320.

The previous prime is 256704756613. The next prime is 256704756629. The reversal of 256704756620 is 26657407652.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (256704756629) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1002335 + ... + 1232105.

It is an arithmetic number, because the mean of its divisors is an integer number (12097610686).

Almost surely, 2^256704756620 is an apocalyptic number.

256704756620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

256704756620 is an abundant number, since it is smaller than the sum of its proper divisors (323980556308).

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

256704756620 is a wasteful number, since it uses less digits than its factorization.

256704756620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234090 (or 234088 counting only the distinct ones).

The product of its (nonzero) digits is 4233600, while the sum is 50.

The spelling of 256704756620 in words is "two hundred fifty-six billion, seven hundred four million, seven hundred fifty-six thousand, six hundred twenty".