57391690 has 8 divisors (see below), whose sum is σ = 103305060. Its totient is φ = 22956672.

The previous prime is 57391679. The next prime is 57391709. The reversal of 57391690 is 9619375.

It can be written as a sum of positive squares in 2 ways, for example, as 57198969 + 192721 = 7563^2 + 439^2 .

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

It is a super-2 number, since 2×57391690² = 6587612162112200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2869575 + ... + 2869594.

Almost surely, 2^57391690 is an apocalyptic number.

57391690 is a deficient number, since it is larger than the sum of its proper divisors (45913370).

57391690 is a wasteful number, since it uses less digits than its factorization.

57391690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5739176.

The product of its (nonzero) digits is 51030, while the sum is 40.

The square root of 57391690 is about 7575.7303278298. The cubic root of 57391690 is about 385.7296333954.

It can be divided in two parts, 57391 and 690, that added together give a square (58081 = 241²).

The spelling of 57391690 in words is "fifty-seven million, three hundred ninety-one thousand, six hundred ninety".