87121839192 has 64 divisors (see below), whose sum is σ = 221677478400. Its totient is φ = 28525530240.

The previous prime is 87121839163. The next prime is 87121839199. The reversal of 87121839192 is 29193812178.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87121839199) 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, 1041633 + ... + 1122159.

It is an arithmetic number, because the mean of its divisors is an integer number (3463710600).

Almost surely, 2^87121839192 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 87121839192, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (110838739200).

87121839192 is an abundant number, since it is smaller than the sum of its proper divisors (134555639208).

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

87121839192 is a wasteful number, since it uses less digits than its factorization.

87121839192 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81336 (or 81332 counting only the distinct ones).

The product of its digits is 435456, while the sum is 51.

The spelling of 87121839192 in words is "eighty-seven billion, one hundred twenty-one million, eight hundred thirty-nine thousand, one hundred ninety-two".