643624404 has 48 divisors (see below), whose sum is σ = 1513982400. Its totient is φ = 212808960.

The previous prime is 643624381. The next prime is 643624427. The reversal of 643624404 is 404426346.

It is an interprime number because it is at equal distance from previous prime (643624381) and next prime (643624427).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1310599 + ... + 1311089.

It is an arithmetic number, because the mean of its divisors is an integer number (31541300).

Almost surely, 2^643624404 is an apocalyptic number.

It is an amenable number.

643624404 is an abundant number, since it is smaller than the sum of its proper divisors (870357996).

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

643624404 is a wasteful number, since it uses less digits than its factorization.

643624404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1160 (or 1158 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 33.

The square root of 643624404 is about 25369.7537236765. The cubic root of 643624404 is about 863.3975942719.

The spelling of 643624404 in words is "six hundred forty-three million, six hundred twenty-four thousand, four hundred four".