649520980 has 24 divisors (see below), whose sum is σ = 1365791112. Its totient is φ = 259466112.

The previous prime is 649520951. The next prime is 649520999. The reversal of 649520980 is 89025946.

It can be written as a sum of positive squares in 4 ways, for example, as 22619536 + 626901444 = 4756^2 + 25038^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5547 + ... + 36466.

It is an arithmetic number, because the mean of its divisors is an integer number (56907963).

Almost surely, 2^649520980 is an apocalyptic number.

It is an amenable number.

649520980 is an abundant number, since it is smaller than the sum of its proper divisors (716270132).

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

649520980 is a wasteful number, since it uses less digits than its factorization.

649520980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42795 (or 42793 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 43.

The square root of 649520980 is about 25485.7014814189. The cubic root of 649520980 is about 866.0262602999.

The spelling of 649520980 in words is "six hundred forty-nine million, five hundred twenty thousand, nine hundred eighty".