57142730 has 16 divisors (see below), whose sum is σ = 102970440. Its totient is φ = 22831872.

The previous prime is 57142699. The next prime is 57142733. The reversal of 57142730 is 3724175.

It can be written as a sum of positive squares in 4 ways, for example, as 53597041 + 3545689 = 7321^2 + 1883^2 .

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 57142693 and 57142702.

It is not an unprimeable number, because it can be changed into a prime (57142733) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8366 + ... + 13574.

Almost surely, 2^57142730 is an apocalyptic number.

57142730 is a deficient number, since it is larger than the sum of its proper divisors (45827710).

57142730 is a wasteful number, since it uses less digits than its factorization.

57142730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6313.

The product of its (nonzero) digits is 5880, while the sum is 29.

The square root of 57142730 is about 7559.2810504703. The cubic root of 57142730 is about 385.1710714419.

The spelling of 57142730 in words is "fifty-seven million, one hundred forty-two thousand, seven hundred thirty".