86191220 has 24 divisors (see below), whose sum is σ = 190528800. Its totient is φ = 32661792.

The previous prime is 86191211. The next prime is 86191223. The reversal of 86191220 is 2219168.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86191223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 113030 + ... + 113789.

It is an arithmetic number, because the mean of its divisors is an integer number (7938700).

Almost surely, 2^86191220 is an apocalyptic number.

It is an amenable number.

86191220 is an abundant number, since it is smaller than the sum of its proper divisors (104337580).

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

86191220 is a wasteful number, since it uses less digits than its factorization.

86191220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226847 (or 226845 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 86191220 is about 9283.9226623233. The cubic root of 86191220 is about 441.7274036958.

The spelling of 86191220 in words is "eighty-six million, one hundred ninety-one thousand, two hundred twenty".