649604408 has 32 divisors (see below), whose sum is σ = 1334134800. Its totient is φ = 295153152.

The previous prime is 649604401. The next prime is 649604413. The reversal of 649604408 is 804406946.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649604401) 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, 78410 + ... + 86297.

Almost surely, 2^649604408 is an apocalyptic number.

649604408 is a gapful number since it is divisible by the number (68) formed by its first and last digit.

It is an amenable number.

649604408 is an abundant number, since it is smaller than the sum of its proper divisors (684530392).

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

649604408 is a wasteful number, since it uses less digits than its factorization.

649604408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164759 (or 164755 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 41.

The square root of 649604408 is about 25487.3381897757. The cubic root of 649604408 is about 866.0633377502.

The spelling of 649604408 in words is "six hundred forty-nine million, six hundred four thousand, four hundred eight".