57991320 has 48 divisors (see below), whose sum is σ = 188472960. Its totient is φ = 15464256.

The previous prime is 57991319. The next prime is 57991327. The reversal of 57991320 is 2319975.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57991327) 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, 80184 + ... + 80903.

It is an arithmetic number, because the mean of its divisors is an integer number (3926520).

Almost surely, 2^57991320 is an apocalyptic number.

It is an amenable number.

57991320 is an abundant number, since it is smaller than the sum of its proper divisors (130481640).

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

57991320 is a wasteful number, since it uses less digits than its factorization.

57991320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161104 (or 161097 counting only the distinct ones).

The product of its (nonzero) digits is 17010, while the sum is 36.

The square root of 57991320 is about 7615.2032146227. The cubic root of 57991320 is about 387.0683532091.

It can be divided in two parts, 57991 and 320, that added together give a triangular number (58311 = T₃₄₁).

The spelling of 57991320 in words is "fifty-seven million, nine hundred ninety-one thousand, three hundred twenty".