649905168 has 40 divisors (see below), whose sum is σ = 1831552416. Its totient is φ = 196940800.

The previous prime is 649905083. The next prime is 649905169. The reversal of 649905168 is 861509946.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is not an unprimeable number, because it can be changed into a prime (649905169) 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, 614913 + ... + 615968.

Almost surely, 2^649905168 is an apocalyptic number.

It is an amenable number.

649905168 is an abundant number, since it is smaller than the sum of its proper divisors (1181647248).

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

649905168 is a wasteful number, since it uses less digits than its factorization.

649905168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1230903 (or 1230897 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 48.

The square root of 649905168 is about 25493.2376915919. The cubic root of 649905168 is about 866.1969765296.

The spelling of 649905168 in words is "six hundred forty-nine million, nine hundred five thousand, one hundred sixty-eight".