257716406 has 16 divisors (see below), whose sum is σ = 396482688. Its totient is φ = 125563200.

The previous prime is 257716397. The next prime is 257716421. The reversal of 257716406 is 604617752.

It is a self number, because there is not a number n which added to its sum of digits gives 257716406.

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, 98171 + ... + 100761.

It is an arithmetic number, because the mean of its divisors is an integer number (24780168).

Almost surely, 2^257716406 is an apocalyptic number.

257716406 is a deficient number, since it is larger than the sum of its proper divisors (138766282).

257716406 is a wasteful number, since it uses less digits than its factorization.

257716406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3847.

The product of its (nonzero) digits is 70560, while the sum is 38.

The square root of 257716406 is about 16053.5480813433. The cubic root of 257716406 is about 636.3763364107.

The spelling of 257716406 in words is "two hundred fifty-seven million, seven hundred sixteen thousand, four hundred six".