257639473 has 16 divisors (see below), whose sum is σ = 325669120. Its totient is φ = 198334656.

The previous prime is 257639467. The next prime is 257639483. The reversal of 257639473 is 374936752.

257639473 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 257639473 - 2⁵ = 257639441 is a prime.

It is not an unprimeable number, because it can be changed into a prime (257639423) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34893 + ... + 41626.

It is an arithmetic number, because the mean of its divisors is an integer number (20354320).

Almost surely, 2^257639473 is an apocalyptic number.

It is an amenable number.

257639473 is a deficient number, since it is larger than the sum of its proper divisors (68029647).

257639473 is a wasteful number, since it uses less digits than its factorization.

257639473 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76576.

The product of its digits is 952560, while the sum is 46.

The square root of 257639473 is about 16051.1517655276. The cubic root of 257639473 is about 636.3130068335.

The spelling of 257639473 in words is "two hundred fifty-seven million, six hundred thirty-nine thousand, four hundred seventy-three".