649900972920 has 256 divisors, whose sum is σ = 2097673251840. Its totient is φ = 160657440768.

The previous prime is 649900972909. The next prime is 649900972993. The reversal of 649900972920 is 29279009946.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 26232459 + ... + 26257221.

It is an arithmetic number, because the mean of its divisors is an integer number (8194036140).

Almost surely, 2^649900972920 is an apocalyptic number.

649900972920 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 649900972920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1048836625920).

649900972920 is an abundant number, since it is smaller than the sum of its proper divisors (1447772278920).

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

649900972920 is a wasteful number, since it uses less digits than its factorization.

649900972920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25094 (or 25090 counting only the distinct ones).

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

The spelling of 649900972920 in words is "six hundred forty-nine billion, nine hundred million, nine hundred seventy-two thousand, nine hundred twenty".