257487998 has 4 divisors (see below), whose sum is σ = 386232000. Its totient is φ = 128743998.

The previous prime is 257487983. The next prime is 257488039. The reversal of 257487998 is 899784752.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×257487998² = 132600138228096008, which contains 22 as substring.

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, 64371998 + ... + 64372001.

It is an arithmetic number, because the mean of its divisors is an integer number (96558000).

Almost surely, 2^257487998 is an apocalyptic number.

257487998 is a deficient number, since it is larger than the sum of its proper divisors (128744002).

257487998 is a wasteful number, since it uses less digits than its factorization.

257487998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128744001.

The product of its digits is 10160640, while the sum is 59.

The square root of 257487998 is about 16046.4325630341. The cubic root of 257487998 is about 636.1882790408.

The spelling of 257487998 in words is "two hundred fifty-seven million, four hundred eighty-seven thousand, nine hundred ninety-eight".