83891358487 has 16 divisors (see below), whose sum is σ = 89550784512. Its totient is φ = 78405307200.

The previous prime is 83891358461. The next prime is 83891358511. The reversal of 83891358487 is 78485319838.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-83891358487 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (83891388487) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 585118 + ... + 714244.

It is an arithmetic number, because the mean of its divisors is an integer number (5596924032).

Almost surely, 2^83891358487 is an apocalyptic number.

83891358487 is a deficient number, since it is larger than the sum of its proper divisors (5659426025).

83891358487 is a wasteful number, since it uses less digits than its factorization.

83891358487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129798.

The product of its digits is 46448640, while the sum is 64.

The spelling of 83891358487 in words is "eighty-three billion, eight hundred ninety-one million, three hundred fifty-eight thousand, four hundred eighty-seven".