57911993 has 4 divisors (see below), whose sum is σ = 59477220. Its totient is φ = 56346768.

The previous prime is 57911989. The next prime is 57912077. The reversal of 57911993 is 39911975.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 49168144 + 8743849 = 7012^2 + 2957^2 .

It is a cyclic number.

It is not a de Polignac number, because 57911993 - 2² = 57911989 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (57911933) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 782558 + ... + 782631.

It is an arithmetic number, because the mean of its divisors is an integer number (14869305).

Almost surely, 2^57911993 is an apocalyptic number.

It is an amenable number.

57911993 is a deficient number, since it is larger than the sum of its proper divisors (1565227).

57911993 is a wasteful number, since it uses less digits than its factorization.

57911993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1565226.

The product of its digits is 76545, while the sum is 44.

The square root of 57911993 is about 7609.9929697734. The cubic root of 57911993 is about 386.8917809079.

The spelling of 57911993 in words is "fifty-seven million, nine hundred eleven thousand, nine hundred ninety-three".