649839708 has 36 divisors (see below), whose sum is σ = 1877315440. Its totient is φ = 185668416.

The previous prime is 649839703. The next prime is 649839721. The reversal of 649839708 is 807938946.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649839703) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1289113 + ... + 1289616.

Almost surely, 2^649839708 is an apocalyptic number.

It is an amenable number.

649839708 is an abundant number, since it is smaller than the sum of its proper divisors (1227475732).

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

649839708 is a wasteful number, since it uses less digits than its factorization.

649839708 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2578746 (or 2578741 counting only the distinct ones).

The product of its (nonzero) digits is 2612736, while the sum is 54.

The square root of 649839708 is about 25491.9537893822. The cubic root of 649839708 is about 866.1678937440.

It can be divided in two parts, 64983 and 9708, that added together give a triangular number (74691 = T₃₈₆).

The spelling of 649839708 in words is "six hundred forty-nine million, eight hundred thirty-nine thousand, seven hundred eight".