256406364320 has 48 divisors (see below), whose sum is σ = 618648565248. Its totient is φ = 100380360960.

The previous prime is 256406364307. The next prime is 256406364341. The reversal of 256406364320 is 23463604652.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17040776 + ... + 17055815.

It is an arithmetic number, because the mean of its divisors is an integer number (12888511776).

Almost surely, 2^256406364320 is an apocalyptic number.

256406364320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

256406364320 is an abundant number, since it is smaller than the sum of its proper divisors (362242200928).

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

256406364320 is a wasteful number, since it uses less digits than its factorization.

256406364320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34096653 (or 34096645 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 41.

Adding to 256406364320 its reverse (23463604652), we get a palindrome (279869968972).

The spelling of 256406364320 in words is "two hundred fifty-six billion, four hundred six million, three hundred sixty-four thousand, three hundred twenty".