257420756 has 12 divisors (see below), whose sum is σ = 450599520. Its totient is φ = 128678040.

The previous prime is 257420753. The next prime is 257420771. The reversal of 257420756 is 657024752.

It is a happy number.

It is a super-2 number, since 2×257420756² = 132530891239223072, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257420753) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23771 + ... + 32861.

It is an arithmetic number, because the mean of its divisors is an integer number (37549960).

Almost surely, 2^257420756 is an apocalyptic number.

It is an amenable number.

257420756 is a deficient number, since it is larger than the sum of its proper divisors (193178764).

257420756 is a wasteful number, since it uses less digits than its factorization.

257420756 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16174 (or 16172 counting only the distinct ones).

The product of its (nonzero) digits is 117600, while the sum is 38.

The square root of 257420756 is about 16044.3371941629. The cubic root of 257420756 is about 636.1328948456.

The spelling of 257420756 in words is "two hundred fifty-seven million, four hundred twenty thousand, seven hundred fifty-six".