649905936 has 40 divisors (see below), whose sum is σ = 1699162080. Its totient is φ = 214023936.

The previous prime is 649905931. The next prime is 649905983. The reversal of 649905936 is 639509946.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (649905931) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 77581 + ... + 85548.

It is an arithmetic number, because the mean of its divisors is an integer number (42479052).

Almost surely, 2^649905936 is an apocalyptic number.

It is an amenable number.

649905936 is an abundant number, since it is smaller than the sum of its proper divisors (1049256144).

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

649905936 is a wasteful number, since it uses less digits than its factorization.

649905936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163223 (or 163217 counting only the distinct ones).

The product of its (nonzero) digits is 1574640, while the sum is 51.

The square root of 649905936 is about 25493.2527544054. The cubic root of 649905936 is about 866.1973177275.

The spelling of 649905936 in words is "six hundred forty-nine million, nine hundred five thousand, nine hundred thirty-six".