649397072 has 20 divisors (see below), whose sum is σ = 1259556660. Its totient is φ = 324350208.

The previous prime is 649397069. The next prime is 649397081. The reversal of 649397072 is 270793946.

It can be written as a sum of positive squares in 2 ways, for example, as 167857936 + 481539136 = 12956^2 + 21944^2 .

It is a hoax number, since the sum of its digits (47) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6047 + ... + 36542.

It is an arithmetic number, because the mean of its divisors is an integer number (62977833).

Almost surely, 2^649397072 is an apocalyptic number.

It is an amenable number.

649397072 is a deficient number, since it is larger than the sum of its proper divisors (610159588).

649397072 is a wasteful number, since it uses less digits than its factorization.

649397072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43550 (or 43544 counting only the distinct ones).

The product of its (nonzero) digits is 571536, while the sum is 47.

The square root of 649397072 is about 25483.2704337571. The cubic root of 649397072 is about 865.9711866844.

The spelling of 649397072 in words is "six hundred forty-nine million, three hundred ninety-seven thousand, seventy-two".