257672739 has 4 divisors (see below), whose sum is σ = 343563656. Its totient is φ = 171781824.

The previous prime is 257672729. The next prime is 257672747. The reversal of 257672739 is 937276752.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 257672739 - 2⁹ = 257672227 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (257672719) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42945454 + ... + 42945459.

It is an arithmetic number, because the mean of its divisors is an integer number (85890914).

Almost surely, 2^257672739 is an apocalyptic number.

257672739 is a deficient number, since it is larger than the sum of its proper divisors (85890917).

257672739 is an equidigital number, since it uses as much as digits as its factorization.

257672739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85890916.

The product of its digits is 1111320, while the sum is 48.

The square root of 257672739 is about 16052.1879817052. The cubic root of 257672739 is about 636.3403922301.

The spelling of 257672739 in words is "two hundred fifty-seven million, six hundred seventy-two thousand, seven hundred thirty-nine".