87021708 has 48 divisors (see below), whose sum is σ = 217455840. Its totient is φ = 26988544.

The previous prime is 87021667. The next prime is 87021731. The reversal of 87021708 is 80712078.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15760 + ... + 20552.

It is an arithmetic number, because the mean of its divisors is an integer number (4530330).

Almost surely, 2^87021708 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 87021708, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (108727920).

87021708 is an abundant number, since it is smaller than the sum of its proper divisors (130434132).

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

87021708 is a wasteful number, since it uses less digits than its factorization.

87021708 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4906 (or 4904 counting only the distinct ones).

The product of its (nonzero) digits is 6272, while the sum is 33.

The square root of 87021708 is about 9328.5426514542. The cubic root of 87021708 is about 443.1416131972.

It can be divided in two parts, 870 and 21708, that added together give a triangular number (22578 = T₂₁₂).

The spelling of 87021708 in words is "eighty-seven million, twenty-one thousand, seven hundred eight".