257788971 has 12 divisors (see below), whose sum is σ = 406213080. Its totient is φ = 156235680.

The previous prime is 257788967. The next prime is 257788981. The reversal of 257788971 is 179887752.

It is a happy number.

It is not a de Polignac number, because 257788971 - 2² = 257788967 is a prime.

It is not an unprimeable number, because it can be changed into a prime (257788931) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1301866 + ... + 1302063.

It is an arithmetic number, because the mean of its divisors is an integer number (33851090).

Almost surely, 2^257788971 is an apocalyptic number.

257788971 is a deficient number, since it is larger than the sum of its proper divisors (148424109).

257788971 is a wasteful number, since it uses less digits than its factorization.

257788971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2603946 (or 2603943 counting only the distinct ones).

The product of its digits is 1975680, while the sum is 54.

The square root of 257788971 is about 16055.8080145473. The cubic root of 257788971 is about 636.4360587959.

The spelling of 257788971 in words is "two hundred fifty-seven million, seven hundred eighty-eight thousand, nine hundred seventy-one".