257928388 has 6 divisors (see below), whose sum is σ = 451374686. Its totient is φ = 128964192.

The previous prime is 257928383. The next prime is 257928397. The reversal of 257928388 is 883829752.

It can be written as a sum of positive squares in only one way, i.e., 163021824 + 94906564 = 12768^2 + 9742^2 .

It is not an unprimeable number, because it can be changed into a prime (257928383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32241045 + ... + 32241052.

Almost surely, 2^257928388 is an apocalyptic number.

It is an amenable number.

257928388 is a deficient number, since it is larger than the sum of its proper divisors (193446298).

257928388 is a wasteful number, since it uses less digits than its factorization.

257928388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64482101 (or 64482099 counting only the distinct ones).

The product of its digits is 1935360, while the sum is 52.

The square root of 257928388 is about 16060.1490653107. The cubic root of 257928388 is about 636.5507702139.

The spelling of 257928388 in words is "two hundred fifty-seven million, nine hundred twenty-eight thousand, three hundred eighty-eight".