257672738 has 8 divisors (see below), whose sum is σ = 386831388. Its totient is φ = 128728944.

The previous prime is 257672729. The next prime is 257672747. The reversal of 257672738 is 837276752.

It is an interprime number because it is at equal distance from previous prime (257672729) and next prime (257672747).

It can be written as a sum of positive squares in 2 ways, for example, as 203547289 + 54125449 = 14267^2 + 7357^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 257672692 and 257672701.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50681 + ... + 55532.

Almost surely, 2^257672738 is an apocalyptic number.

257672738 is a deficient number, since it is larger than the sum of its proper divisors (129158650).

257672738 is a wasteful number, since it uses less digits than its factorization.

257672738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107428.

The product of its digits is 987840, while the sum is 47.

The square root of 257672738 is about 16052.1879505568. The cubic root of 257672738 is about 636.3403914070.

The spelling of 257672738 in words is "two hundred fifty-seven million, six hundred seventy-two thousand, seven hundred thirty-eight".