643422874 has 16 divisors (see below), whose sum is σ = 983088576. Its totient is φ = 315767200.

The previous prime is 643422869. The next prime is 643422877. The reversal of 643422874 is 478224346.

It is not an unprimeable number, because it can be changed into a prime (643422877) 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, 22254 + ... + 42214.

It is an arithmetic number, because the mean of its divisors is an integer number (61443036).

Almost surely, 2^643422874 is an apocalyptic number.

643422874 is a deficient number, since it is larger than the sum of its proper divisors (339665702).

643422874 is a wasteful number, since it uses less digits than its factorization.

643422874 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20261.

The product of its digits is 258048, while the sum is 40.

The square root of 643422874 is about 25365.7815570504. The cubic root of 643422874 is about 863.3074699281.

The spelling of 643422874 in words is "six hundred forty-three million, four hundred twenty-two thousand, eight hundred seventy-four".