649168520 has 256 divisors, whose sum is σ = 2028257280. Its totient is φ = 180403200.

The previous prime is 649168483. The next prime is 649168543. The reversal of 649168520 is 25861946.

It is a happy 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, 1240979 + ... + 1241501.

It is an arithmetic number, because the mean of its divisors is an integer number (7922880).

Almost surely, 2^649168520 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 649168520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1014128640).

649168520 is an abundant number, since it is smaller than the sum of its proper divisors (1379088760).

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

649168520 is a wasteful number, since it uses less digits than its factorization.

649168520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 596 (or 592 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 41.

The square root of 649168520 is about 25478.7856853501. The cubic root of 649168520 is about 865.8695833774.

The spelling of 649168520 in words is "six hundred forty-nine million, one hundred sixty-eight thousand, five hundred twenty".