86173812 has 18 divisors (see below), whose sum is σ = 217828338. Its totient is φ = 28724592.

The previous prime is 86173811. The next prime is 86173823. The reversal of 86173812 is 21837168.

86173812 is a `hidden beast` number, since 8 + 617 + 38 + 1 + 2 = 666.

It can be written as a sum of positive squares in only one way, i.e., 65707236 + 20466576 = 8106^2 + 4524^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×86173812² = 14851851749222688, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 2393717 = 86173812 / (8 + 6 + 1 + 7 + 3 + 8 + 1 + 2).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86173811) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1196823 + ... + 1196894.

Almost surely, 2^86173812 is an apocalyptic number.

It is an amenable number.

86173812 is an abundant number, since it is smaller than the sum of its proper divisors (131654526).

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

86173812 is a wasteful number, since it uses less digits than its factorization.

86173812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2393727 (or 2393722 counting only the distinct ones).

The product of its digits is 16128, while the sum is 36.

The square root of 86173812 is about 9282.9850802422. The cubic root of 86173812 is about 441.6976632017.

The spelling of 86173812 in words is "eighty-six million, one hundred seventy-three thousand, eight hundred twelve".