57721730 has 16 divisors (see below), whose sum is σ = 113344704. Its totient is φ = 20989680.

The previous prime is 57721691. The next prime is 57721759. The reversal of 57721730 is 3712775.

It is a super-2 number, since 2×57721730² = 6663596228385800, which contains 22 as substring.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 262262 + ... + 262481.

It is an arithmetic number, because the mean of its divisors is an integer number (7084044).

Almost surely, 2^57721730 is an apocalyptic number.

57721730 is a deficient number, since it is larger than the sum of its proper divisors (55622974).

57721730 is a wasteful number, since it uses less digits than its factorization.

57721730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 524761.

The product of its (nonzero) digits is 10290, while the sum is 32.

The square root of 57721730 is about 7597.4818196558. The cubic root of 57721730 is about 386.4676203372.

The spelling of 57721730 in words is "fifty-seven million, seven hundred twenty-one thousand, seven hundred thirty".