649622646 has 16 divisors (see below), whose sum is σ = 1443606000. Its totient is φ = 216540864.

The previous prime is 649622621. The next prime is 649622647. The reversal of 649622646 is 646226946.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649622647) 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, 6014971 + ... + 6015078.

It is an arithmetic number, because the mean of its divisors is an integer number (90225375).

Almost surely, 2^649622646 is an apocalyptic number.

649622646 is an abundant number, since it is smaller than the sum of its proper divisors (793983354).

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

649622646 is a wasteful number, since it uses less digits than its factorization.

649622646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12030060 (or 12030054 counting only the distinct ones).

The product of its digits is 746496, while the sum is 45.

The square root of 649622646 is about 25487.6959727630. The cubic root of 649622646 is about 866.0714427421.

The spelling of 649622646 in words is "six hundred forty-nine million, six hundred twenty-two thousand, six hundred forty-six".