645422980 has 12 divisors (see below), whose sum is σ = 1355388300. Its totient is φ = 258169184.

The previous prime is 645422957. The next prime is 645423001. The reversal of 645422980 is 89224546.

645422980 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 276091456 + 369331524 = 16616^2 + 19218^2 .

It is a super-2 number, since 2×645422980² = 833141646224160800, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16135555 + ... + 16135594.

It is an arithmetic number, because the mean of its divisors is an integer number (112949025).

Almost surely, 2^645422980 is an apocalyptic number.

It is an amenable number.

645422980 is an abundant number, since it is smaller than the sum of its proper divisors (709965320).

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

645422980 is a wasteful number, since it uses less digits than its factorization.

645422980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32271158 (or 32271156 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 40.

The square root of 645422980 is about 25405.1762442224. The cubic root of 645422980 is about 864.2010866690.

The spelling of 645422980 in words is "six hundred forty-five million, four hundred twenty-two thousand, nine hundred eighty".