649612964 has 96 divisors (see below), whose sum is σ = 1606886400. Its totient is φ = 221304960.

The previous prime is 649612961. The next prime is 649612969. The reversal of 649612964 is 469216946.

It is not an unprimeable number, because it can be changed into a prime (649612961) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 71807 + ... + 80345.

It is an arithmetic number, because the mean of its divisors is an integer number (16738400).

Almost surely, 2^649612964 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 649612964, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (803443200).

649612964 is an abundant number, since it is smaller than the sum of its proper divisors (957273436).

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

649612964 is a wasteful number, since it uses less digits than its factorization.

649612964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8593 (or 8591 counting only the distinct ones).

The product of its digits is 559872, while the sum is 47.

The square root of 649612964 is about 25487.5060372725. The cubic root of 649612964 is about 866.0671400671.

The spelling of 649612964 in words is "six hundred forty-nine million, six hundred twelve thousand, nine hundred sixty-four".