642953822 has 16 divisors (see below), whose sum is σ = 1150129152. Its totient is φ = 263571000.

The previous prime is 642953791. The next prime is 642953837. The reversal of 642953822 is 228359246.

642953822 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 642953822.

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, 998054 + ... + 998697.

It is an arithmetic number, because the mean of its divisors is an integer number (71883072).

Almost surely, 2^642953822 is an apocalyptic number.

642953822 is a deficient number, since it is larger than the sum of its proper divisors (507175330).

642953822 is a wasteful number, since it uses less digits than its factorization.

642953822 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1996783.

The product of its digits is 207360, while the sum is 41.

The square root of 642953822 is about 25356.5341085883. The cubic root of 642953822 is about 863.0976366803.

The spelling of 642953822 in words is "six hundred forty-two million, nine hundred fifty-three thousand, eight hundred twenty-two".