649940776 has 16 divisors (see below), whose sum is σ = 1222096500. Its totient is φ = 324048384.

The previous prime is 649940747. The next prime is 649940777. The reversal of 649940776 is 677049946.

It can be written as a sum of positive squares in 2 ways, for example, as 643839876 + 6100900 = 25374^2 + 2470^2 .

It is not an unprimeable number, because it can be changed into a prime (649940777) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 112251 + ... + 117898.

Almost surely, 2^649940776 is an apocalyptic number.

It is an amenable number.

649940776 is a deficient number, since it is larger than the sum of its proper divisors (572155724).

649940776 is a wasteful number, since it uses less digits than its factorization.

649940776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230508 (or 230504 counting only the distinct ones).

The product of its (nonzero) digits is 2286144, while the sum is 52.

The square root of 649940776 is about 25493.9360633073. The cubic root of 649940776 is about 866.2127957496.

The spelling of 649940776 in words is "six hundred forty-nine million, nine hundred forty thousand, seven hundred seventy-six".