649848688 has 40 divisors (see below), whose sum is σ = 1314197136. Its totient is φ = 311001600.

The previous prime is 649848653. The next prime is 649848709. The reversal of 649848688 is 886848946.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25423 + ... + 44113.

Almost surely, 2^649848688 is an apocalyptic number.

It is an amenable number.

649848688 is an abundant number, since it is smaller than the sum of its proper divisors (664348448).

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

649848688 is a wasteful number, since it uses less digits than its factorization.

649848688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18793 (or 18787 counting only the distinct ones).

The product of its digits is 21233664, while the sum is 61.

The square root of 649848688 is about 25492.1299227821. The cubic root of 649848688 is about 866.1718835237.

The spelling of 649848688 in words is "six hundred forty-nine million, eight hundred forty-eight thousand, six hundred eighty-eight".