642398673 has 24 divisors (see below), whose sum is σ = 997436160. Its totient is φ = 366693600.

The previous prime is 642398663. The next prime is 642398689. The reversal of 642398673 is 376893246.

It is not a de Polignac number, because 642398673 - 2⁴ = 642398657 is a prime.

It is not an unprimeable number, because it can be changed into a prime (642398663) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 189568 + ... + 192926.

It is an arithmetic number, because the mean of its divisors is an integer number (41559840).

Almost surely, 2^642398673 is an apocalyptic number.

It is an amenable number.

642398673 is a deficient number, since it is larger than the sum of its proper divisors (355037487).

642398673 is a wasteful number, since it uses less digits than its factorization.

642398673 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4677 (or 4670 counting only the distinct ones).

The product of its digits is 1306368, while the sum is 48.

The square root of 642398673 is about 25345.5848817896. The cubic root of 642398673 is about 862.8491555069.

The spelling of 642398673 in words is "six hundred forty-two million, three hundred ninety-eight thousand, six hundred seventy-three".