57021730 has 32 divisors (see below), whose sum is σ = 105338880. Its totient is φ = 22216320.

The previous prime is 57021709. The next prime is 57021737. The reversal of 57021730 is 3712075.

It is a junction number, because it is equal to n+sod(n) for n = 57021695 and 57021704.

It is not an unprimeable number, because it can be changed into a prime (57021737) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 74550 + ... + 75310.

It is an arithmetic number, because the mean of its divisors is an integer number (3291840).

Almost surely, 2^57021730 is an apocalyptic number.

57021730 is a deficient number, since it is larger than the sum of its proper divisors (48317150).

57021730 is a wasteful number, since it uses less digits than its factorization.

57021730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 954.

The product of its (nonzero) digits is 1470, while the sum is 25.

The square root of 57021730 is about 7551.2734025461. The cubic root of 57021730 is about 384.8990121363.

The spelling of 57021730 in words is "fifty-seven million, twenty-one thousand, seven hundred thirty".