643476104 has 24 divisors (see below), whose sum is σ = 1212116430. Its totient is φ = 320250240.

The previous prime is 643476073. The next prime is 643476143. The reversal of 643476104 is 401674346.

It can be written as a sum of positive squares in only one way, i.e., 624900004 + 18576100 = 24998^2 + 4310^2 .

It is a super-2 number, since 2×643476104² = 828122992838037632, which contains 22 as substring.

It is a congruent number.

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, 1485872 + ... + 1486304.

Almost surely, 2^643476104 is an apocalyptic number.

It is an amenable number.

643476104 is a deficient number, since it is larger than the sum of its proper divisors (568640326).

643476104 is an equidigital number, since it uses as much as digits as its factorization.

643476104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1301 (or 866 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 35.

The square root of 643476104 is about 25366.8307835252. The cubic root of 643476104 is about 863.3312762465.

The spelling of 643476104 in words is "six hundred forty-three million, four hundred seventy-six thousand, one hundred four".