643393480 has 32 divisors (see below), whose sum is σ = 1468031040. Its totient is φ = 253731520.

The previous prime is 643393453. The next prime is 643393501. The reversal of 643393480 is 84393346.

643393480 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 110434 + ... + 116113.

It is an arithmetic number, because the mean of its divisors is an integer number (45875970).

Almost surely, 2^643393480 is an apocalyptic number.

It is an amenable number.

643393480 is an abundant number, since it is smaller than the sum of its proper divisors (824637560).

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

643393480 is a wasteful number, since it uses less digits than its factorization.

643393480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226629 (or 226625 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 40.

The square root of 643393480 is about 25365.2021478245. The cubic root of 643393480 is about 863.2943233402.

The spelling of 643393480 in words is "six hundred forty-three million, three hundred ninety-three thousand, four hundred eighty".