257047660 has 48 divisors (see below), whose sum is σ = 566737920. Its totient is φ = 97801920.

The previous prime is 257047627. The next prime is 257047663. The reversal of 257047660 is 66740752.

It is a super-2 number, since 2×257047660² = 132146999022951200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (257047663) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33067 + ... + 40093.

It is an arithmetic number, because the mean of its divisors is an integer number (11807040).

Almost surely, 2^257047660 is an apocalyptic number.

257047660 is a gapful number since it is divisible by the number (20) 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 257047660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (283368960).

257047660 is an abundant number, since it is smaller than the sum of its proper divisors (309690260).

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

257047660 is a wasteful number, since it uses less digits than its factorization.

257047660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7126 (or 7124 counting only the distinct ones).

The product of its (nonzero) digits is 70560, while the sum is 37.

The square root of 257047660 is about 16032.7059475311. The cubic root of 257047660 is about 635.8254171867.

The spelling of 257047660 in words is "two hundred fifty-seven million, forty-seven thousand, six hundred sixty".