257987870 has 16 divisors (see below), whose sum is σ = 530718048. Its totient is φ = 88452960.

The previous prime is 257987861. The next prime is 257987881. The reversal of 257987870 is 78789752.

257987870 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1842701 + ... + 1842840.

It is an arithmetic number, because the mean of its divisors is an integer number (33169878).

Almost surely, 2^257987870 is an apocalyptic number.

257987870 is an abundant number, since it is smaller than the sum of its proper divisors (272730178).

257987870 is a wasteful number, since it uses less digits than its factorization.

257987870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3685555.

The product of its (nonzero) digits is 1975680, while the sum is 53.

The square root of 257987870 is about 16062.0008093637. Note that the first 3 decimals coincide. The cubic root of 257987870 is about 636.5996990438.

The spelling of 257987870 in words is "two hundred fifty-seven million, nine hundred eighty-seven thousand, eight hundred seventy".