642086780 has 24 divisors (see below), whose sum is σ = 1349956608. Its totient is φ = 256534848.

The previous prime is 642086771. The next prime is 642086813. The reversal of 642086780 is 87680246.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 764 + ... + 35843.

It is an arithmetic number, because the mean of its divisors is an integer number (56248192).

Almost surely, 2^642086780 is an apocalyptic number.

It is an amenable number.

642086780 is an abundant number, since it is smaller than the sum of its proper divisors (707869828).

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

642086780 is a wasteful number, since it uses less digits than its factorization.

642086780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37493 (or 37491 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 41.

The square root of 642086780 is about 25339.4313274785. The cubic root of 642086780 is about 862.7094913659.

The spelling of 642086780 in words is "six hundred forty-two million, eighty-six thousand, seven hundred eighty".