561427980 has 48 divisors (see below), whose sum is σ = 1622713344. Its totient is φ = 144884160.

The previous prime is 561427943. The next prime is 561427981. The reversal of 561427980 is 89724165.

It is not an unprimeable number, because it can be changed into a prime (561427981) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 149062 + ... + 152781.

It is an arithmetic number, because the mean of its divisors is an integer number (33806528).

Almost surely, 2^561427980 is an apocalyptic number.

It is an amenable number.

561427980 is an abundant number, since it is smaller than the sum of its proper divisors (1061285364).

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

561427980 is a wasteful number, since it uses less digits than its factorization.

561427980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 301886 (or 301884 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 42.

The square root of 561427980 is about 23694.4715070837. The cubic root of 561427980 is about 824.9570739832.

The spelling of 561427980 in words is "five hundred sixty-one million, four hundred twenty-seven thousand, nine hundred eighty".