643000074 has 16 divisors (see below), whose sum is σ = 1290748800. Its totient is φ = 213541920.

The previous prime is 643000067. The next prime is 643000079. The reversal of 643000074 is 470000346.

It is not an unprimeable number, because it can be changed into a prime (643000079) 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, 196099 + ... + 199350.

It is an arithmetic number, because the mean of its divisors is an integer number (80671800).

Almost surely, 2^643000074 is an apocalyptic number.

643000074 is an abundant number, since it is smaller than the sum of its proper divisors (647748726).

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

643000074 is a wasteful number, since it uses less digits than its factorization.

643000074 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 395725.

The product of its (nonzero) digits is 2016, while the sum is 24.

The square root of 643000074 is about 25357.4461253495. The cubic root of 643000074 is about 863.1183323267.

The spelling of 643000074 in words is "six hundred forty-three million, seventy-four", and thus it is an aban number.