649721304 has 32 divisors (see below), whose sum is σ = 1804782000. Its totient is φ = 216573696.

The previous prime is 649721297. The next prime is 649721323. The reversal of 649721304 is 403127946.

649721304 is a `hidden beast` number, since 649 + 7 + 2 + 1 + 3 + 0 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

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, 1503769 + ... + 1504200.

Almost surely, 2^649721304 is an apocalyptic number.

It is an amenable number.

649721304 is an abundant number, since it is smaller than the sum of its proper divisors (1155060696).

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

649721304 is a wasteful number, since it uses less digits than its factorization.

649721304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3007984 (or 3007974 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 36.

The square root of 649721304 is about 25489.6313037282. The cubic root of 649721304 is about 866.1152838611.

The spelling of 649721304 in words is "six hundred forty-nine million, seven hundred twenty-one thousand, three hundred four".