86721156 has 36 divisors (see below), whose sum is σ = 219553152. Its totient is φ = 28862064.

The previous prime is 86721133. The next prime is 86721161. The reversal of 86721156 is 65112768.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 86721156.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 28165 + ... + 31091.

Almost surely, 2^86721156 is an apocalyptic number.

It is an amenable number.

86721156 is an abundant number, since it is smaller than the sum of its proper divisors (132831996).

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

86721156 is a wasteful number, since it uses less digits than its factorization.

86721156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3760 (or 3755 counting only the distinct ones).

The product of its digits is 20160, while the sum is 36.

The square root of 86721156 is about 9312.4194493161. The cubic root of 86721156 is about 442.6308566357.

The spelling of 86721156 in words is "eighty-six million, seven hundred twenty-one thousand, one hundred fifty-six".