649031531928 has 64 divisors (see below), whose sum is σ = 1839360633600. Its totient is φ = 189191376000.

The previous prime is 649031531923. The next prime is 649031531959. The reversal of 649031531928 is 829135130946.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649031531921) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 54736948 + ... + 54748803.

It is an arithmetic number, because the mean of its divisors is an integer number (28740009900).

Almost surely, 2^649031531928 is an apocalyptic number.

It is an amenable number.

649031531928 is an abundant number, since it is smaller than the sum of its proper divisors (1190329101672).

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

649031531928 is a wasteful number, since it uses less digits than its factorization.

649031531928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109485792 (or 109485788 counting only the distinct ones).

The product of its (nonzero) digits is 1399680, while the sum is 51.

The spelling of 649031531928 in words is "six hundred forty-nine billion, thirty-one million, five hundred thirty-one thousand, nine hundred twenty-eight".