257487764 has 6 divisors (see below), whose sum is σ = 450603594. Its totient is φ = 128743880.

The previous prime is 257487751. The next prime is 257487779. The reversal of 257487764 is 467784752.

It can be written as a sum of positive squares in only one way, i.e., 203347600 + 54140164 = 14260^2 + 7358^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32185967 + ... + 32185974.

It is an arithmetic number, because the mean of its divisors is an integer number (75100599).

Almost surely, 2^257487764 is an apocalyptic number.

It is an amenable number.

257487764 is a deficient number, since it is larger than the sum of its proper divisors (193115830).

257487764 is a wasteful number, since it uses less digits than its factorization.

257487764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64371945 (or 64371943 counting only the distinct ones).

The product of its digits is 2634240, while the sum is 50.

The square root of 257487764 is about 16046.4252716921. The cubic root of 257487764 is about 636.1880863223.

The spelling of 257487764 in words is "two hundred fifty-seven million, four hundred eighty-seven thousand, seven hundred sixty-four".