649057972 has 6 divisors (see below), whose sum is σ = 1135851458. Its totient is φ = 324528984.

The previous prime is 649057889. The next prime is 649057973. The reversal of 649057972 is 279750946.

It can be written as a sum of positive squares in only one way, i.e., 562828176 + 86229796 = 23724^2 + 9286^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649057973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81132243 + ... + 81132250.

Almost surely, 2^649057972 is an apocalyptic number.

It is an amenable number.

649057972 is a deficient number, since it is larger than the sum of its proper divisors (486793486).

649057972 is a wasteful number, since it uses less digits than its factorization.

649057972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162264497 (or 162264495 counting only the distinct ones).

The product of its (nonzero) digits is 952560, while the sum is 49.

The square root of 649057972 is about 25476.6161803329. The cubic root of 649057972 is about 865.8204304576.

The spelling of 649057972 in words is "six hundred forty-nine million, fifty-seven thousand, nine hundred seventy-two".