643080372 has 24 divisors (see below), whose sum is σ = 1636932192. Its totient is φ = 194872800.

The previous prime is 643080343. The next prime is 643080377. The reversal of 643080372 is 273080346.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643080377) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2435779 + ... + 2436042.

It is an arithmetic number, because the mean of its divisors is an integer number (68205508).

Almost surely, 2^643080372 is an apocalyptic number.

It is an amenable number.

643080372 is an abundant number, since it is smaller than the sum of its proper divisors (993851820).

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

643080372 is a wasteful number, since it uses less digits than its factorization.

643080372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4871839 (or 4871837 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 33.

The square root of 643080372 is about 25359.0293978299. The cubic root of 643080372 is about 863.1542596377.

The spelling of 643080372 in words is "six hundred forty-three million, eighty thousand, three hundred seventy-two".