57205380 has 48 divisors (see below), whose sum is σ = 161663040. Its totient is φ = 15113088.

The previous prime is 57205363. The next prime is 57205387. The reversal of 57205380 is 8350275.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (57205387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2167 + ... + 10913.

It is an arithmetic number, because the mean of its divisors is an integer number (3367980).

Almost surely, 2^57205380 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 57205380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (80831520).

57205380 is an abundant number, since it is smaller than the sum of its proper divisors (104457660).

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

57205380 is a wasteful number, since it uses less digits than its factorization.

57205380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8868 (or 8866 counting only the distinct ones).

The product of its (nonzero) digits is 8400, while the sum is 30.

The square root of 57205380 is about 7563.4238278705. The cubic root of 57205380 is about 385.3117843206.

The spelling of 57205380 in words is "fifty-seven million, two hundred five thousand, three hundred eighty".