86172870 has 144 divisors (see below), whose sum is σ = 252666864. Its totient is φ = 18748800.

The previous prime is 86172829. The next prime is 86172887. The reversal of 86172870 is 7827168.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 1412640 + ... + 1412700.

It is an arithmetic number, because the mean of its divisors is an integer number (1754631).

Almost surely, 2^86172870 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 86172870, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (126333432).

86172870 is an abundant number, since it is smaller than the sum of its proper divisors (166493994).

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

86172870 is a wasteful number, since it uses less digits than its factorization.

86172870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147 (or 109 counting only the distinct ones).

The product of its (nonzero) digits is 37632, while the sum is 39.

The square root of 86172870 is about 9282.9343421140. The cubic root of 86172870 is about 441.6960537386.

The spelling of 86172870 in words is "eighty-six million, one hundred seventy-two thousand, eight hundred seventy".