643626714 has 16 divisors (see below), whose sum is σ = 1288715328. Its totient is φ = 214298592.

The previous prime is 643626689. The next prime is 643626773. The reversal of 643626714 is 417626346.

It is a happy number.

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, 55147 + ... + 65790.

It is an arithmetic number, because the mean of its divisors is an integer number (80544708).

Almost surely, 2^643626714 is an apocalyptic number.

643626714 is an abundant number, since it is smaller than the sum of its proper divisors (645088614).

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

643626714 is a wasteful number, since it uses less digits than its factorization.

643626714 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121829.

The product of its digits is 145152, while the sum is 39.

The square root of 643626714 is about 25369.7992502897. The cubic root of 643626714 is about 863.3986271963.

The spelling of 643626714 in words is "six hundred forty-three million, six hundred twenty-six thousand, seven hundred fourteen".