257564136 has 32 divisors (see below), whose sum is σ = 657613440. Its totient is φ = 84027648.

The previous prime is 257564123. The next prime is 257564137. The reversal of 257564136 is 631465752.

It is a junction number, because it is equal to n+sod(n) for n = 257564094 and 257564103.

It is not an unprimeable number, because it can be changed into a prime (257564137) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 113041 + ... + 115296.

It is an arithmetic number, because the mean of its divisors is an integer number (20550420).

Almost surely, 2^257564136 is an apocalyptic number.

It is an amenable number.

257564136 is an abundant number, since it is smaller than the sum of its proper divisors (400049304).

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

257564136 is a wasteful number, since it uses less digits than its factorization.

257564136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228393 (or 228389 counting only the distinct ones).

The product of its digits is 151200, while the sum is 39.

The square root of 257564136 is about 16048.8048153126. The cubic root of 257564136 is about 636.2509788301.

It can be divided in two parts, 25756 and 4136, that added together give a palindrome (29892).

The spelling of 257564136 in words is "two hundred fifty-seven million, five hundred sixty-four thousand, one hundred thirty-six".