57661979 has 16 divisors (see below), whose sum is σ = 62052480. Its totient is φ = 53424000.

The previous prime is 57661973. The next prime is 57661991. The reversal of 57661979 is 97916675.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-57661979 is a prime.

Its product of digits (714420) is a multiple of the sum of its prime divisors (490).

It is not an unprimeable number, because it can be changed into a prime (57661973) 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 15 ways as a sum of consecutive naturals, for example, 229604 + ... + 229854.

It is an arithmetic number, because the mean of its divisors is an integer number (3878280).

Almost surely, 2^57661979 is an apocalyptic number.

57661979 is a deficient number, since it is larger than the sum of its proper divisors (4390501).

57661979 is a wasteful number, since it uses less digits than its factorization.

57661979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 490.

The product of its digits is 714420, while the sum is 50.

The square root of 57661979 is about 7593.5485117302. The cubic root of 57661979 is about 386.3342228614.

The spelling of 57661979 in words is "fifty-seven million, six hundred sixty-one thousand, nine hundred seventy-nine".