86181820 has 24 divisors (see below), whose sum is σ = 181162800. Its totient is φ = 34438272.

The previous prime is 86181817. The next prime is 86181871. The reversal of 86181820 is 2818168.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30216 + ... + 32944.

It is an arithmetic number, because the mean of its divisors is an integer number (7548450).

Almost surely, 2^86181820 is an apocalyptic number.

It is an amenable number.

86181820 is an abundant number, since it is smaller than the sum of its proper divisors (94980980).

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

86181820 is a wasteful number, since it uses less digits than its factorization.

86181820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4317 (or 4315 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 34.

The square root of 86181820 is about 9283.4163969952. The cubic root of 86181820 is about 441.7113448731.

Adding to 86181820 its reverse (2818168), we get a palindrome (88999988).

The spelling of 86181820 in words is "eighty-six million, one hundred eighty-one thousand, eight hundred twenty".