649654900 has 72 divisors (see below), whose sum is σ = 1445220000. Its totient is φ = 253399680.

The previous prime is 649654871. The next prime is 649654913. The reversal of 649654900 is 9456946.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 878731 + ... + 879469.

It is an arithmetic number, because the mean of its divisors is an integer number (20072500).

Almost surely, 2^649654900 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 649654900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (722610000).

649654900 is an abundant number, since it is smaller than the sum of its proper divisors (795565100).

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

649654900 is a wasteful number, since it uses less digits than its factorization.

649654900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 961 (or 954 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 43.

The square root of 649654900 is about 25488.3287015842. The cubic root of 649654900 is about 866.0857760920.

The spelling of 649654900 in words is "six hundred forty-nine million, six hundred fifty-four thousand, nine hundred".