646574404 has 18 divisors (see below), whose sum is σ = 1316241150. Its totient is φ = 277103232.

The previous prime is 646574393. The next prime is 646574419. The reversal of 646574404 is 404475646.

It can be written as a sum of positive squares in only one way, i.e., 645668100 + 906304 = 25410^2 + 952^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1649229 + ... + 1649620.

Almost surely, 2^646574404 is an apocalyptic number.

It is an amenable number.

646574404 is an abundant number, since it is smaller than the sum of its proper divisors (669666746).

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

646574404 is a wasteful number, since it uses less digits than its factorization.

646574404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3298867 (or 3298858 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 40.

The square root of 646574404 is about 25427.8273550848. The cubic root of 646574404 is about 864.7146882212.

The spelling of 646574404 in words is "six hundred forty-six million, five hundred seventy-four thousand, four hundred four".