646108464 has 80 divisors (see below), whose sum is σ = 1699335680. Its totient is φ = 211507200.

The previous prime is 646108459. The next prime is 646108481. The reversal of 646108464 is 464801646.

It is a super-2 number, since 2×646108464² = 834912294504878592, which contains 22 as substring.

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, 702597 + ... + 703515.

It is an arithmetic number, because the mean of its divisors is an integer number (21241696).

Almost surely, 2^646108464 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 646108464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (849667840).

646108464 is an abundant number, since it is smaller than the sum of its proper divisors (1053227216).

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

646108464 is a wasteful number, since it uses less digits than its factorization.

646108464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1178 (or 1172 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 39.

The square root of 646108464 is about 25418.6636942228. The cubic root of 646108464 is about 864.5069255983.

The spelling of 646108464 in words is "six hundred forty-six million, one hundred eight thousand, four hundred sixty-four".