643740460 has 48 divisors (see below), whose sum is σ = 1477338912. Its totient is φ = 233676800.

The previous prime is 643740431. The next prime is 643740469. The reversal of 643740460 is 64047346.

It is not an unprimeable number, because it can be changed into a prime (643740469) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 141420 + ... + 145900.

It is an arithmetic number, because the mean of its divisors is an integer number (30777894).

Almost surely, 2^643740460 is an apocalyptic number.

It is an amenable number.

643740460 is an abundant number, since it is smaller than the sum of its proper divisors (833598452).

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

643740460 is a wasteful number, since it uses less digits than its factorization.

643740460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5154 (or 5152 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 34.

The square root of 643740460 is about 25372.0409112078. The cubic root of 643740460 is about 863.4494860525.

The spelling of 643740460 in words is "six hundred forty-three million, seven hundred forty thousand, four hundred sixty".