642860785726 has 32 divisors (see below), whose sum is σ = 993953669760. Its totient is φ = 311672342016.

The previous prime is 642860785687. The next prime is 642860785783. The reversal of 642860785726 is 627587068246.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27148620 + ... + 27172288.

It is an arithmetic number, because the mean of its divisors is an integer number (31061052180).

Almost surely, 2^642860785726 is an apocalyptic number.

642860785726 is a deficient number, since it is larger than the sum of its proper divisors (351092884034).

642860785726 is a wasteful number, since it uses less digits than its factorization.

642860785726 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26388.

The product of its (nonzero) digits is 54190080, while the sum is 61.

The spelling of 642860785726 in words is "six hundred forty-two billion, eight hundred sixty million, seven hundred eighty-five thousand, seven hundred twenty-six".