57042157 has 8 divisors (see below), whose sum is σ = 60617592. Its totient is φ = 53491200.

The previous prime is 57042143. The next prime is 57042163. The reversal of 57042157 is 75124075.

It can be written as a sum of positive squares in 4 ways, for example, as 13402921 + 43639236 = 3661^2 + 6606^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-57042157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57042457) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1194 + ... + 10747.

It is an arithmetic number, because the mean of its divisors is an integer number (7577199).

Almost surely, 2^57042157 is an apocalyptic number.

57042157 is the 4777-th heptagonal number.

It is an amenable number.

57042157 is a deficient number, since it is larger than the sum of its proper divisors (3575435).

57042157 is a wasteful number, since it uses less digits than its factorization.

57042157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12239.

The product of its (nonzero) digits is 9800, while the sum is 31.

The square root of 57042157 is about 7552.6258347677. The cubic root of 57042157 is about 384.9449676779.

The spelling of 57042157 in words is "fifty-seven million, forty-two thousand, one hundred fifty-seven".