643360384 has 16 divisors (see below), whose sum is σ = 1281694770. Its totient is φ = 321680128.

The previous prime is 643360369. The next prime is 643360411. The reversal of 643360384 is 483063346.

It can be written as a sum of positive squares in only one way, i.e., 621006400 + 22353984 = 24920^2 + 4728^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2512999 + ... + 2513254.

Almost surely, 2^643360384 is an apocalyptic number.

643360384 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

643360384 is a deficient number, since it is larger than the sum of its proper divisors (638334386).

643360384 is an equidigital number, since it uses as much as digits as its factorization.

643360384 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5026267 (or 5026255 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 37.

The square root of 643360384 is about 25364.5497496013. The cubic root of 643360384 is about 863.2795205382.

The spelling of 643360384 in words is "six hundred forty-three million, three hundred sixty thousand, three hundred eighty-four".