257704157 has 4 divisors (see below), whose sum is σ = 257737116. Its totient is φ = 257671200.

The previous prime is 257704151. The next prime is 257704159. The reversal of 257704157 is 751407752.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 46321636 + 211382521 = 6806^2 + 14539^2 .

It is a cyclic number.

It is not a de Polignac number, because 257704157 - 2⁶ = 257704093 is a prime.

It is a super-2 number, since 2×257704157² = 132822865070161298, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 257704157.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257704151) 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, 2657 + ... + 22857.

It is an arithmetic number, because the mean of its divisors is an integer number (64434279).

Almost surely, 2^257704157 is an apocalyptic number.

It is an amenable number.

257704157 is a deficient number, since it is larger than the sum of its proper divisors (32959).

257704157 is a wasteful number, since it uses less digits than its factorization.

257704157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32958.

The product of its (nonzero) digits is 68600, while the sum is 38.

The square root of 257704157 is about 16053.1665723620. The cubic root of 257704157 is about 636.3662541432.

The spelling of 257704157 in words is "two hundred fifty-seven million, seven hundred four thousand, one hundred fifty-seven".