57280020 has 72 divisors (see below), whose sum is σ = 186578784. Its totient is φ = 13091904.

The previous prime is 57280007. The next prime is 57280061. The reversal of 57280020 is 2008275.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6802 + ... + 12681.

It is an arithmetic number, because the mean of its divisors is an integer number (2591372).

Almost surely, 2^57280020 is an apocalyptic number.

It is an amenable number.

57280020 is an abundant number, since it is smaller than the sum of its proper divisors (129298764).

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

57280020 is a wasteful number, since it uses less digits than its factorization.

57280020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19509 (or 19500 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 24.

The square root of 57280020 is about 7568.3564926607. The cubic root of 57280020 is about 385.4792928799.

Adding to 57280020 its reverse (2008275), we get a palindrome (59288295).

The spelling of 57280020 in words is "fifty-seven million, two hundred eighty thousand, twenty".