257152730 has 8 divisors (see below), whose sum is σ = 462874932. Its totient is φ = 102861088.

The previous prime is 257152681. The next prime is 257152733. The reversal of 257152730 is 37251752.

It can be written as a sum of positive squares in 2 ways, for example, as 250304041 + 6848689 = 15821^2 + 2617^2 .

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

It is a super-2 number, since 2×257152730² = 132255053092905800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (257152733) 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, 12857627 + ... + 12857646.

Almost surely, 2^257152730 is an apocalyptic number.

257152730 is a deficient number, since it is larger than the sum of its proper divisors (205722202).

257152730 is a wasteful number, since it uses less digits than its factorization.

257152730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25715280.

The product of its (nonzero) digits is 14700, while the sum is 32.

The square root of 257152730 is about 16035.9823521978. The cubic root of 257152730 is about 635.9120380572.

The spelling of 257152730 in words is "two hundred fifty-seven million, one hundred fifty-two thousand, seven hundred thirty".