642811326 has 16 divisors (see below), whose sum is σ = 1291390464. Its totient is φ = 213309144.

The previous prime is 642811283. The next prime is 642811349. The reversal of 642811326 is 623118246.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 238876 + ... + 241551.

It is an arithmetic number, because the mean of its divisors is an integer number (80711904).

Almost surely, 2^642811326 is an apocalyptic number.

642811326 is an abundant number, since it is smaller than the sum of its proper divisors (648579138).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

642811326 is a wasteful number, since it uses less digits than its factorization.

642811326 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 480655.

The product of its digits is 13824, while the sum is 33.

The square root of 642811326 is about 25353.7241051487. The cubic root of 642811326 is about 863.0338700232.

The spelling of 642811326 in words is "six hundred forty-two million, eight hundred eleven thousand, three hundred twenty-six".