57991536 has 60 divisors (see below), whose sum is σ = 163031232. Its totient is φ = 19243008.

The previous prime is 57991523. The next prime is 57991537. The reversal of 57991536 is 63519975.

57991536 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 57991491 and 57991500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57991537) 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 11 ways as a sum of consecutive naturals, for example, 36225 + ... + 37791.

Almost surely, 2^57991536 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 57991536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81515616).

57991536 is an abundant number, since it is smaller than the sum of its proper divisors (105039696).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

57991536 is a wasteful number, since it uses less digits than its factorization.

57991536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1838 (or 1829 counting only the distinct ones).

The product of its digits is 255150, while the sum is 45.

The square root of 57991536 is about 7615.2173967655. The cubic root of 57991536 is about 387.0688337790.

The spelling of 57991536 in words is "fifty-seven million, nine hundred ninety-one thousand, five hundred thirty-six".