257541660 has 48 divisors (see below), whose sum is σ = 801242400. Its totient is φ = 68677632.

The previous prime is 257541611. The next prime is 257541673. The reversal of 257541660 is 66145752.

It is a happy number.

257541660 is a `hidden beast` number, since 2 + 57 + 541 + 6 + 60 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 237925 + ... + 239004.

It is an arithmetic number, because the mean of its divisors is an integer number (16692550).

Almost surely, 2^257541660 is an apocalyptic number.

257541660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

257541660 is an abundant number, since it is smaller than the sum of its proper divisors (543700740).

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

257541660 is a wasteful number, since it uses less digits than its factorization.

257541660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 476947 (or 476939 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 36.

The square root of 257541660 is about 16048.1045609754. The cubic root of 257541660 is about 636.2324710865.

The spelling of 257541660 in words is "two hundred fifty-seven million, five hundred forty-one thousand, six hundred sixty".