57042729 has 12 divisors (see below), whose sum is σ = 82815876. Its totient is φ = 37834272.

The previous prime is 57042721. The next prime is 57042743. The reversal of 57042729 is 92724075.

It can be written as a sum of positive squares in 2 ways, for example, as 43204329 + 13838400 = 6573^2 + 3720^2 .

It is not a de Polignac number, because 57042729 - 2³ = 57042721 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 57042693 and 57042702.

It is not an unprimeable number, because it can be changed into a prime (57042721) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14314 + ... + 17859.

It is an arithmetic number, because the mean of its divisors is an integer number (6901323).

Almost surely, 2^57042729 is an apocalyptic number.

It is an amenable number.

57042729 is a deficient number, since it is larger than the sum of its proper divisors (25773147).

57042729 is a wasteful number, since it uses less digits than its factorization.

57042729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32376 (or 32373 counting only the distinct ones).

The product of its (nonzero) digits is 35280, while the sum is 36.

The square root of 57042729 is about 7552.6637022974. The cubic root of 57042729 is about 384.9462543742.

The spelling of 57042729 in words is "fifty-seven million, forty-two thousand, seven hundred twenty-nine".