642392767 has 4 divisors (see below), whose sum is σ = 653280840. Its totient is φ = 631504696.

The previous prime is 642392761. The next prime is 642392771. The reversal of 642392767 is 767293246.

642392767 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 642392767 - 2³ = 642392759 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642392761) 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, 5443948 + ... + 5444065.

It is an arithmetic number, because the mean of its divisors is an integer number (163320210).

Almost surely, 2^642392767 is an apocalyptic number.

642392767 is a deficient number, since it is larger than the sum of its proper divisors (10888073).

642392767 is a wasteful number, since it uses less digits than its factorization.

642392767 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10888072.

The product of its digits is 762048, while the sum is 46.

The square root of 642392767 is about 25345.4683720779. The cubic root of 642392767 is about 862.8465112493.

The spelling of 642392767 in words is "six hundred forty-two million, three hundred ninety-two thousand, seven hundred sixty-seven".