87921912 has 96 divisors (see below), whose sum is σ = 243097200. Its totient is φ = 26477568.

The previous prime is 87921901. The next prime is 87921929. The reversal of 87921912 is 21912978.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 214764 + ... + 215172.

Almost surely, 2^87921912 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 87921912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (121548600).

87921912 is an abundant number, since it is smaller than the sum of its proper divisors (155175288).

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

87921912 is a wasteful number, since it uses less digits than its factorization.

87921912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 497 (or 480 counting only the distinct ones).

The product of its digits is 18144, while the sum is 39.

The square root of 87921912 is about 9376.6684915273. The cubic root of 87921912 is about 444.6644139086.

It can be divided in two parts, 879 and 21912, that added together give a triangular number (22791 = T₂₁₃).

The spelling of 87921912 in words is "eighty-seven million, nine hundred twenty-one thousand, nine hundred twelve".