56665980 has 240 divisors, whose sum is σ = 214663680. Its totient is φ = 12223872.

The previous prime is 56665943. The next prime is 56665993. The reversal of 56665980 is 8956665.

It is a super-2 number, since 2×56665980² = 6422066578720800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 215329 + ... + 215591.

It is an arithmetic number, because the mean of its divisors is an integer number (894432).

Almost surely, 2^56665980 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 56665980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (107331840).

56665980 is an abundant number, since it is smaller than the sum of its proper divisors (157997700).

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

56665980 is a wasteful number, since it uses less digits than its factorization.

56665980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 310 (or 299 counting only the distinct ones).

The product of its (nonzero) digits is 388800, while the sum is 45.

The square root of 56665980 is about 7527.6809177860. The cubic root of 56665980 is about 384.0968993743.

The spelling of 56665980 in words is "fifty-six million, six hundred sixty-five thousand, nine hundred eighty".