643262880 has 96 divisors (see below), whose sum is σ = 2182166784. Its totient is φ = 158340096.

The previous prime is 643262863. The next prime is 643262903. The reversal of 643262880 is 88262346.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (39).

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, 45304 + ... + 57783.

It is an arithmetic number, because the mean of its divisors is an integer number (22730904).

Almost surely, 2^643262880 is an apocalyptic number.

643262880 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

643262880 is an abundant number, since it is smaller than the sum of its proper divisors (1538903904).

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

643262880 is a wasteful number, since it uses less digits than its factorization.

643262880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103118 (or 103110 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 39.

The square root of 643262880 is about 25362.6276241244. The cubic root of 643262880 is about 863.2359071083.

The spelling of 643262880 in words is "six hundred forty-three million, two hundred sixty-two thousand, eight hundred eighty".