72389556891 has 6 divisors (see below), whose sum is σ = 104562693300. Its totient is φ = 48259704588.

The previous prime is 72389556871. The next prime is 72389556929. The reversal of 72389556891 is 19865598327.

72389556891 is a `hidden beast` number, since 72 + 3 + 8 + 9 + 556 + 8 + 9 + 1 = 666.

It is not a de Polignac number, because 72389556891 - 2³⁴ = 55209687707 is a prime.

It is not an unprimeable number, because it can be changed into a prime (72389556871) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 4021642041 + ... + 4021642058.

It is an arithmetic number, because the mean of its divisors is an integer number (17427115550).

Almost surely, 2^72389556891 is an apocalyptic number.

72389556891 is a deficient number, since it is larger than the sum of its proper divisors (32173136409).

72389556891 is a wasteful number, since it uses less digits than its factorization.

72389556891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8043284105 (or 8043284102 counting only the distinct ones).

The product of its digits is 32659200, while the sum is 63.

The spelling of 72389556891 in words is "seventy-two billion, three hundred eighty-nine million, five hundred fifty-six thousand, eight hundred ninety-one".