87921712789 has 8 divisors (see below), whose sum is σ = 88445266272. Its totient is φ = 87398335920.

The previous prime is 87921712751. The next prime is 87921712873. The reversal of 87921712789 is 98721712978.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 87921712789 - 2⁷ = 87921712661 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 (87921712729) 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 7 ways as a sum of consecutive naturals, for example, 1032154 + ... + 1114084.

It is an arithmetic number, because the mean of its divisors is an integer number (11055658284).

Almost surely, 2^87921712789 is an apocalyptic number.

It is an amenable number.

87921712789 is a deficient number, since it is larger than the sum of its proper divisors (523553483).

87921712789 is a wasteful number, since it uses less digits than its factorization.

87921712789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88307.

The product of its digits is 7112448, while the sum is 61.

The spelling of 87921712789 in words is "eighty-seven billion, nine hundred twenty-one million, seven hundred twelve thousand, seven hundred eighty-nine".