642772941 has 16 divisors (see below), whose sum is σ = 936718848. Its totient is φ = 390297600.

The previous prime is 642772939. The next prime is 642772951. The reversal of 642772941 is 149277246.

It is not a de Polignac number, because 642772941 - 2¹ = 642772939 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 642772893 and 642772902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642772951) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 201700 + ... + 204861.

It is an arithmetic number, because the mean of its divisors is an integer number (58544928).

Almost surely, 2^642772941 is an apocalyptic number.

It is an amenable number.

642772941 is a deficient number, since it is larger than the sum of its proper divisors (293945907).

642772941 is a wasteful number, since it uses less digits than its factorization.

642772941 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 406612.

The product of its digits is 169344, while the sum is 42.

The square root of 642772941 is about 25352.9671044633. The cubic root of 642772941 is about 863.0166912061.

The spelling of 642772941 in words is "six hundred forty-two million, seven hundred seventy-two thousand, nine hundred forty-one".