57121340 has 24 divisors (see below), whose sum is σ = 123198432. Its totient is φ = 22230720.

The previous prime is 57121307. The next prime is 57121367. The reversal of 57121340 is 4312175.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37856 + ... + 39335.

It is an arithmetic number, because the mean of its divisors is an integer number (5133268).

Almost surely, 2^57121340 is an apocalyptic number.

It is an amenable number.

57121340 is an abundant number, since it is smaller than the sum of its proper divisors (66077092).

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

57121340 is a wasteful number, since it uses less digits than its factorization.

57121340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77237 (or 77235 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 23.

The square root of 57121340 is about 7557.8661009573. The cubic root of 57121340 is about 385.1230056166.

The spelling of 57121340 in words is "fifty-seven million, one hundred twenty-one thousand, three hundred forty".