642336897 has 4 divisors (see below), whose sum is σ = 856449200. Its totient is φ = 428224596.

The previous prime is 642336889. The next prime is 642336899. The reversal of 642336897 is 798633246.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 642336897 - 2³ = 642336889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (642336899) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 107056147 + ... + 107056152.

It is an arithmetic number, because the mean of its divisors is an integer number (214112300).

Almost surely, 2^642336897 is an apocalyptic number.

It is an amenable number.

642336897 is a deficient number, since it is larger than the sum of its proper divisors (214112303).

642336897 is a wasteful number, since it uses less digits than its factorization.

642336897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214112302.

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

The square root of 642336897 is about 25344.3661786994. The cubic root of 642336897 is about 862.8214961108.

The spelling of 642336897 in words is "six hundred forty-two million, three hundred thirty-six thousand, eight hundred ninety-seven".