257997580 has 24 divisors (see below), whose sum is σ = 570311280. Its totient is φ = 97767360.

The previous prime is 257997577. The next prime is 257997611. The reversal of 257997580 is 85799752.

257997580 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a hoax number, since the sum of its digits (52) coincides with the sum of the digits of its distinct prime factors.

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, 339091 + ... + 339850.

It is an arithmetic number, because the mean of its divisors is an integer number (23762970).

Almost surely, 2^257997580 is an apocalyptic number.

257997580 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

257997580 is an abundant number, since it is smaller than the sum of its proper divisors (312313700).

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

257997580 is a wasteful number, since it uses less digits than its factorization.

257997580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 678969 (or 678967 counting only the distinct ones).

The product of its (nonzero) digits is 1587600, while the sum is 52.

The square root of 257997580 is about 16062.3030727228. The cubic root of 257997580 is about 636.6076856021.

The spelling of 257997580 in words is "two hundred fifty-seven million, nine hundred ninety-seven thousand, five hundred eighty".