257145992 has 32 divisors (see below), whose sum is σ = 499296000. Its totient is φ = 124027200.

The previous prime is 257145991. The next prime is 257146007. The reversal of 257145992 is 299541752.

It is a super-2 number, since 2×257145992² = 132248122403328128, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (257145991) 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, 85067 + ... + 88037.

It is an arithmetic number, because the mean of its divisors is an integer number (15603000).

Almost surely, 2^257145992 is an apocalyptic number.

It is an amenable number.

257145992 is a deficient number, since it is larger than the sum of its proper divisors (242150008).

257145992 is a wasteful number, since it uses less digits than its factorization.

257145992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3357 (or 3353 counting only the distinct ones).

The product of its digits is 226800, while the sum is 44.

The square root of 257145992 is about 16035.7722607924. The cubic root of 257145992 is about 635.9064838835.

The spelling of 257145992 in words is "two hundred fifty-seven million, one hundred forty-five thousand, nine hundred ninety-two".