649987528 has 8 divisors (see below), whose sum is σ = 1218726630. Its totient is φ = 324993760.

The previous prime is 649987517. The next prime is 649987553. The reversal of 649987528 is 825789946.

It can be written as a sum of positive squares in only one way, i.e., 628103844 + 21883684 = 25062^2 + 4678^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40624213 + ... + 40624228.

Almost surely, 2^649987528 is an apocalyptic number.

It is an amenable number.

649987528 is a deficient number, since it is larger than the sum of its proper divisors (568739102).

649987528 is a wasteful number, since it uses less digits than its factorization.

649987528 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81248447 (or 81248443 counting only the distinct ones).

The product of its digits is 8709120, while the sum is 58.

The square root of 649987528 is about 25494.8529707469. The cubic root of 649987528 is about 866.2335649290.

The spelling of 649987528 in words is "six hundred forty-nine million, nine hundred eighty-seven thousand, five hundred twenty-eight".