642803886 has 24 divisors (see below), whose sum is σ = 1430384904. Its totient is φ = 208476720.

The previous prime is 642803873. The next prime is 642803893. The reversal of 642803886 is 688308246.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 481920 + ... + 483251.

It is an arithmetic number, because the mean of its divisors is an integer number (59599371).

Almost surely, 2^642803886 is an apocalyptic number.

642803886 is an abundant number, since it is smaller than the sum of its proper divisors (787581018).

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

642803886 is a wasteful number, since it uses less digits than its factorization.

642803886 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 965216 (or 965213 counting only the distinct ones).

The product of its (nonzero) digits is 442368, while the sum is 45.

The square root of 642803886 is about 25353.5773807169. The cubic root of 642803886 is about 863.0305403802.

The spelling of 642803886 in words is "six hundred forty-two million, eight hundred three thousand, eight hundred eighty-six".