649591670 has 64 divisors (see below), whose sum is σ = 1485582336. Its totient is φ = 198944640.

The previous prime is 649591667. The next prime is 649591693. The reversal of 649591670 is 76195946.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16697 + ... + 39723.

It is an arithmetic number, because the mean of its divisors is an integer number (23212224).

Almost surely, 2^649591670 is an apocalyptic number.

649591670 is an abundant number, since it is smaller than the sum of its proper divisors (835990666).

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

649591670 is a wasteful number, since it uses less digits than its factorization.

649591670 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23085.

The product of its (nonzero) digits is 408240, while the sum is 47.

The square root of 649591670 is about 25487.0882997646. The cubic root of 649591670 is about 866.0576768758.

The spelling of 649591670 in words is "six hundred forty-nine million, five hundred ninety-one thousand, six hundred seventy".