257021988 has 24 divisors (see below), whose sum is σ = 608166720. Its totient is φ = 84467040.

The previous prime is 257021959. The next prime is 257021993. The reversal of 257021988 is 889120752.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 149983 + ... + 151686.

It is an arithmetic number, because the mean of its divisors is an integer number (25340280).

Almost surely, 2^257021988 is an apocalyptic number.

It is an amenable number.

257021988 is an abundant number, since it is smaller than the sum of its proper divisors (351144732).

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

257021988 is a wasteful number, since it uses less digits than its factorization.

257021988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 301747 (or 301745 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 42.

The square root of 257021988 is about 16031.9053140916. The cubic root of 257021988 is about 635.8042493178.

The spelling of 257021988 in words is "two hundred fifty-seven million, twenty-one thousand, nine hundred eighty-eight".