257000639 has 20 divisors (see below), whose sum is σ = 310238760. Its totient is φ = 212632560.

The previous prime is 257000609. The next prime is 257000663. The reversal of 257000639 is 936000752.

It is not a de Polignac number, because 257000639 - 2⁸ = 257000383 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257000609) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 67784 + ... + 71474.

It is an arithmetic number, because the mean of its divisors is an integer number (15511938).

Almost surely, 2^257000639 is an apocalyptic number.

257000639 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

257000639 is a deficient number, since it is larger than the sum of its proper divisors (53238121).

257000639 is an frugal number, since it uses more digits than its factorization.

257000639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3748 (or 3727 counting only the distinct ones).

The product of its (nonzero) digits is 11340, while the sum is 32.

The square root of 257000639 is about 16031.2394717314. The cubic root of 257000639 is about 635.7866449086.

The spelling of 257000639 in words is "two hundred fifty-seven million, six hundred thirty-nine", and thus it is an aban number.