643532604 has 48 divisors (see below), whose sum is σ = 1764094080. Its totient is φ = 180008640.

The previous prime is 643532599. The next prime is 643532623. The reversal of 643532604 is 406235346.

It is a super-2 number, since 2×643532604² = 828268424822041632, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

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, 185794 + ... + 189225.

It is an arithmetic number, because the mean of its divisors is an integer number (36751960).

Almost surely, 2^643532604 is an apocalyptic number.

It is an amenable number.

643532604 is an abundant number, since it is smaller than the sum of its proper divisors (1120561476).

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

643532604 is a wasteful number, since it uses less digits than its factorization.

643532604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 375050 (or 375048 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 33.

The square root of 643532604 is about 25367.9444181037. The cubic root of 643532604 is about 863.3565435871.

The spelling of 643532604 in words is "six hundred forty-three million, five hundred thirty-two thousand, six hundred four".