86686388 has 6 divisors (see below), whose sum is σ = 151701186. Its totient is φ = 43343192.

The previous prime is 86686387. The next prime is 86686421. The reversal of 86686388 is 88368668.

It can be written as a sum of positive squares in only one way, i.e., 86638864 + 47524 = 9308^2 + 218^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86686387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10835795 + ... + 10835802.

It is an arithmetic number, because the mean of its divisors is an integer number (25283531).

Almost surely, 2^86686388 is an apocalyptic number.

It is an amenable number.

86686388 is a deficient number, since it is larger than the sum of its proper divisors (65014798).

86686388 is a wasteful number, since it uses less digits than its factorization.

86686388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21671601 (or 21671599 counting only the distinct ones).

The product of its digits is 2654208, while the sum is 53.

The square root of 86686388 is about 9310.5525077731. The cubic root of 86686388 is about 442.5716959594.

The spelling of 86686388 in words is "eighty-six million, six hundred eighty-six thousand, three hundred eighty-eight".