257238757 has 8 divisors (see below), whose sum is σ = 258987456. Its totient is φ = 255496032.

The previous prime is 257238749. The next prime is 257238767. The reversal of 257238757 is 757832752.

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

It is a cyclic number.

It is not a de Polignac number, because 257238757 - 2³ = 257238749 is a prime.

It is a super-3 number, since 3×257238757³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257238767) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 112338 + ... + 114604.

It is an arithmetic number, because the mean of its divisors is an integer number (32373432).

Almost surely, 2^257238757 is an apocalyptic number.

It is an amenable number.

257238757 is a deficient number, since it is larger than the sum of its proper divisors (1748699).

257238757 is a wasteful number, since it uses less digits than its factorization.

257238757 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2987.

The product of its digits is 823200, while the sum is 46.

The square root of 257238757 is about 16038.6644394102. The cubic root of 257238757 is about 635.9829421015.

The spelling of 257238757 in words is "two hundred fifty-seven million, two hundred thirty-eight thousand, seven hundred fifty-seven".