57991805 has 12 divisors (see below), whose sum is σ = 70945140. Its totient is φ = 45507072.

The previous prime is 57991799. The next prime is 57991807. The reversal of 57991805 is 50819975.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 1951609 + 56040196 = 1397^2 + 7486^2 .

It is a de Polignac number, because none of the positive numbers 2^k-57991805 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57991807) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11981 + ... + 16109.

It is an arithmetic number, because the mean of its divisors is an integer number (5912095).

Almost surely, 2^57991805 is an apocalyptic number.

It is an amenable number.

57991805 is a deficient number, since it is larger than the sum of its proper divisors (12953335).

57991805 is an equidigital number, since it uses as much as digits as its factorization.

57991805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4240 (or 4187 counting only the distinct ones).

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

The square root of 57991805 is about 7615.2350587490. The cubic root of 57991805 is about 387.0694322650.

The spelling of 57991805 in words is "fifty-seven million, nine hundred ninety-one thousand, eight hundred five".