257163894 has 48 divisors (see below), whose sum is σ = 602338464. Its totient is φ = 78825600.

The previous prime is 257163887. The next prime is 257163899. The reversal of 257163894 is 498361752.

257163894 is a `hidden beast` number, since 2 + 5 + 7 + 1 + 638 + 9 + 4 = 666.

It is a super-2 number, since 2×257163894² = 132266536754486472, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257163899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 63799 + ... + 67709.

It is an arithmetic number, because the mean of its divisors is an integer number (12548718).

Almost surely, 2^257163894 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 257163894, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (301169232).

257163894 is an abundant number, since it is smaller than the sum of its proper divisors (345174570).

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

257163894 is a wasteful number, since it uses less digits than its factorization.

257163894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4213 (or 4210 counting only the distinct ones).

The product of its digits is 362880, while the sum is 45.

The square root of 257163894 is about 16036.3304405964. The cubic root of 257163894 is about 635.9212403955.

The spelling of 257163894 in words is "two hundred fifty-seven million, one hundred sixty-three thousand, eight hundred ninety-four".