256420485748 has 48 divisors (see below), whose sum is σ = 514279584000. Its totient is φ = 109586453760.

The previous prime is 256420485731. The next prime is 256420485767. The reversal of 256420485748 is 847584024652.

It is a happy number.

It is a super-2 number, since 2×256420485748² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

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, 54800073 + ... + 54804751.

It is an arithmetic number, because the mean of its divisors is an integer number (10714158000).

Almost surely, 2^256420485748 is an apocalyptic number.

256420485748 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

256420485748 is an abundant number, since it is smaller than the sum of its proper divisors (257859098252).

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

256420485748 is a wasteful number, since it uses less digits than its factorization.

256420485748 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9760 (or 9758 counting only the distinct ones).

The product of its (nonzero) digits is 17203200, while the sum is 55.

The spelling of 256420485748 in words is "two hundred fifty-six billion, four hundred twenty million, four hundred eighty-five thousand, seven hundred forty-eight".