57281240 has 16 divisors (see below), whose sum is σ = 128882880. Its totient is φ = 22912480.

The previous prime is 57281233. The next prime is 57281243. The reversal of 57281240 is 4218275.

It is a super-2 number, since 2×57281240² = 6562280911875200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57281243) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 715976 + ... + 716055.

It is an arithmetic number, because the mean of its divisors is an integer number (8055180).

Almost surely, 2^57281240 is an apocalyptic number.

It is an amenable number.

57281240 is an abundant number, since it is smaller than the sum of its proper divisors (71601640).

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

57281240 is a wasteful number, since it uses less digits than its factorization.

57281240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1432042 (or 1432038 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 29.

The square root of 57281240 is about 7568.4370909720. The cubic root of 57281240 is about 385.4820296189.

The spelling of 57281240 in words is "fifty-seven million, two hundred eighty-one thousand, two hundred forty".