642689822 has 8 divisors (see below), whose sum is σ = 997277400. Its totient is φ = 310264024.

The previous prime is 642689813. The next prime is 642689843. The reversal of 642689822 is 228986246.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5540372 + ... + 5540487.

It is an arithmetic number, because the mean of its divisors is an integer number (124659675).

Almost surely, 2^642689822 is an apocalyptic number.

642689822 is a deficient number, since it is larger than the sum of its proper divisors (354587578).

642689822 is a wasteful number, since it uses less digits than its factorization.

642689822 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11080890.

The product of its digits is 663552, while the sum is 47.

The square root of 642689822 is about 25351.3278153236. The cubic root of 642689822 is about 862.9794897975.

The spelling of 642689822 in words is "six hundred forty-two million, six hundred eighty-nine thousand, eight hundred twenty-two".