256902401320 has 64 divisors (see below), whose sum is σ = 612746078400. Its totient is φ = 96603386880.

The previous prime is 256902401279. The next prime is 256902401339. The reversal of 256902401320 is 23104209652.

It is a Harshad number since it is a multiple of its sum of digits (34).

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, 364215 + ... + 804025.

It is an arithmetic number, because the mean of its divisors is an integer number (9574157475).

Almost surely, 2^256902401320 is an apocalyptic number.

256902401320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 256902401320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (306373039200).

256902401320 is an abundant number, since it is smaller than the sum of its proper divisors (355843677080).

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

256902401320 is a wasteful number, since it uses less digits than its factorization.

256902401320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 440698 (or 440694 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 34.

The spelling of 256902401320 in words is "two hundred fifty-six billion, nine hundred two million, four hundred one thousand, three hundred twenty".