649923957 has 24 divisors (see below), whose sum is σ = 994967064. Its totient is φ = 407399424.

The previous prime is 649923941. The next prime is 649923961. The reversal of 649923957 is 759329946.

It can be written as a sum of positive squares in 4 ways, for example, as 11553201 + 638370756 = 3399^2 + 25266^2 .

It is not a de Polignac number, because 649923957 - 2⁴ = 649923941 is a prime.

It is a super-2 number, since 2×649923957² = 844802299765075698, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649923917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 300793 + ... + 302945.

It is an arithmetic number, because the mean of its divisors is an integer number (41456961).

Almost surely, 2^649923957 is an apocalyptic number.

It is an amenable number.

649923957 is a deficient number, since it is larger than the sum of its proper divisors (345043107).

649923957 is a wasteful number, since it uses less digits than its factorization.

649923957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4149 (or 4146 counting only the distinct ones).

The product of its digits is 3674160, while the sum is 54.

The square root of 649923957 is about 25493.6061984177. The cubic root of 649923957 is about 866.2053238080.

The spelling of 649923957 in words is "six hundred forty-nine million, nine hundred twenty-three thousand, nine hundred fifty-seven".