649972992 has 72 divisors (see below), whose sum is σ = 1733639040. Its totient is φ = 216186880.

The previous prime is 649972933. The next prime is 649973003. The reversal of 649972992 is 299279946.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 699184 + ... + 700112.

It is an arithmetic number, because the mean of its divisors is an integer number (24078320).

Almost surely, 2^649972992 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 649972992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (866819520).

649972992 is an abundant number, since it is smaller than the sum of its proper divisors (1083666048).

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

649972992 is an equidigital number, since it uses as much as digits as its factorization.

649972992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1859 (or 1845 counting only the distinct ones).

The product of its digits is 4408992, while the sum is 57.

The square root of 649972992 is about 25494.5678920040. The cubic root of 649972992 is about 866.2271075410.

The spelling of 649972992 in words is "six hundred forty-nine million, nine hundred seventy-two thousand, nine hundred ninety-two".