645030980 has 48 divisors (see below), whose sum is σ = 1481034240. Its totient is φ = 234028800.

The previous prime is 645030973. The next prime is 645031039. The reversal of 645030980 is 89030546.

It is a self number, because there is not a number n which added to its sum of digits gives 645030980.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 102320 + ... + 108440.

It is an arithmetic number, because the mean of its divisors is an integer number (30854880).

Almost surely, 2^645030980 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 645030980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (740517120).

645030980 is an abundant number, since it is smaller than the sum of its proper divisors (836003260).

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

645030980 is a wasteful number, since it uses less digits than its factorization.

645030980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6620 (or 6618 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 645030980 is about 25397.4601092314. The cubic root of 645030980 is about 864.0260926762.

The spelling of 645030980 in words is "six hundred forty-five million, thirty thousand, nine hundred eighty".