257171992 has 192 divisors, whose sum is σ = 668131200. Its totient is φ = 91445760.

The previous prime is 257171989. The next prime is 257172007. The reversal of 257171992 is 299171752.

It is a super-2 number, since 2×257171992² = 132274866938496128, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3522868 + ... + 3522940.

It is an arithmetic number, because the mean of its divisors is an integer number (3479850).

Almost surely, 2^257171992 is an apocalyptic number.

257171992 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 257171992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (334065600).

257171992 is an abundant number, since it is smaller than the sum of its proper divisors (410959208).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

257171992 is a wasteful number, since it uses less digits than its factorization.

257171992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166 (or 155 counting only the distinct ones).

The product of its digits is 79380, while the sum is 43.

The square root of 257171992 is about 16036.5829277936. The cubic root of 257171992 is about 635.9279153037.

The spelling of 257171992 in words is "two hundred fifty-seven million, one hundred seventy-one thousand, nine hundred ninety-two".