646006404 has 24 divisors (see below), whose sum is σ = 1509808608. Its totient is φ = 214984000.

The previous prime is 646006391. The next prime is 646006433. The reversal of 646006404 is 404600646.

It is a super-2 number, since 2×646006404² = 834648548018022432, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36222 + ... + 51029.

It is an arithmetic number, because the mean of its divisors is an integer number (62908692).

Almost surely, 2^646006404 is an apocalyptic number.

It is an amenable number.

646006404 is an abundant number, since it is smaller than the sum of its proper divisors (863802204).

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

646006404 is a wasteful number, since it uses less digits than its factorization.

646006404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87875 (or 87873 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 30.

The square root of 646006404 is about 25416.6560349705. The cubic root of 646006404 is about 864.4614037146.

The spelling of 646006404 in words is "six hundred forty-six million, six thousand, four hundred four".