72781868670 has 64 divisors (see below), whose sum is σ = 200643734016. Its totient is φ = 16551400320.

The previous prime is 72781868657. The next prime is 72781868707. The reversal of 72781868670 is 7686818727.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 838276 + ... + 921015.

It is an arithmetic number, because the mean of its divisors is an integer number (3135058344).

Almost surely, 2^72781868670 is an apocalyptic number.

72781868670 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

72781868670 is an abundant number, since it is smaller than the sum of its proper divisors (127861865346).

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

72781868670 is a wasteful number, since it uses less digits than its factorization.

72781868670 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1759505.

The product of its (nonzero) digits is 12644352, while the sum is 60.

The spelling of 72781868670 in words is "seventy-two billion, seven hundred eighty-one million, eight hundred sixty-eight thousand, six hundred seventy".