646754990 has 32 divisors (see below), whose sum is σ = 1345429440. Its totient is φ = 219250944.

The previous prime is 646754989. The next prime is 646755017. The reversal of 646754990 is 99457646.

646754990 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45677 + ... + 58136.

It is an arithmetic number, because the mean of its divisors is an integer number (42044670).

Almost surely, 2^646754990 is an apocalyptic number.

646754990 is an abundant number, since it is smaller than the sum of its proper divisors (698674450).

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

646754990 is a wasteful number, since it uses less digits than its factorization.

646754990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103916.

The product of its (nonzero) digits is 1632960, while the sum is 50.

The square root of 646754990 is about 25431.3780593974. The cubic root of 646754990 is about 864.7951846704.

The spelling of 646754990 in words is "six hundred forty-six million, seven hundred fifty-four thousand, nine hundred ninety".