642945582 has 12 divisors (see below), whose sum is σ = 1393048800. Its totient is φ = 214315188.

The previous prime is 642945581. The next prime is 642945587. The reversal of 642945582 is 285549246.

642945582 is a `hidden beast` number, since 6 + 4 + 2 + 94 + 558 + 2 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642945581) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 17859582 + ... + 17859617.

It is an arithmetic number, because the mean of its divisors is an integer number (116087400).

Almost surely, 2^642945582 is an apocalyptic number.

642945582 is an abundant number, since it is smaller than the sum of its proper divisors (750103218).

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

642945582 is a wasteful number, since it uses less digits than its factorization.

642945582 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35719207 (or 35719204 counting only the distinct ones).

The product of its digits is 691200, while the sum is 45.

The square root of 642945582 is about 25356.3716252937. The cubic root of 642945582 is about 863.0939495545.

The spelling of 642945582 in words is "six hundred forty-two million, nine hundred forty-five thousand, five hundred eighty-two".