256400652460 has 48 divisors (see below), whose sum is σ = 544956056064. Its totient is φ = 101324599488.

The previous prime is 256400652437. The next prime is 256400652517. The reversal of 256400652460 is 64256004652.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 622147 + ... + 948613.

It is an arithmetic number, because the mean of its divisors is an integer number (11353251168).

Almost surely, 2^256400652460 is an apocalyptic number.

256400652460 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

256400652460 is an abundant number, since it is smaller than the sum of its proper divisors (288555403604).

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

256400652460 is a wasteful number, since it uses less digits than its factorization.

256400652460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 326950 (or 326948 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 40.

The spelling of 256400652460 in words is "two hundred fifty-six billion, four hundred million, six hundred fifty-two thousand, four hundred sixty".