57805991 has 4 divisors (see below), whose sum is σ = 57828000. Its totient is φ = 57783984.

The previous prime is 57805973. The next prime is 57805997. The reversal of 57805991 is 19950875.

It is a happy number.

57805991 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 57805991 - 2⁶ = 57805927 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57805997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6431 + ... + 12528.

It is an arithmetic number, because the mean of its divisors is an integer number (14457000).

Almost surely, 2^57805991 is an apocalyptic number.

57805991 is a deficient number, since it is larger than the sum of its proper divisors (22009).

57805991 is a wasteful number, since it uses less digits than its factorization.

57805991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22008.

The product of its (nonzero) digits is 113400, while the sum is 44.

The square root of 57805991 is about 7603.0251216210. The cubic root of 57805991 is about 386.6555814136.

The spelling of 57805991 in words is "fifty-seven million, eight hundred five thousand, nine hundred ninety-one".