86108781 has 8 divisors (see below), whose sum is σ = 125249184. Its totient is φ = 52187120.

The previous prime is 86108777. The next prime is 86108819. The reversal of 86108781 is 18780168.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 86108781 - 2² = 86108777 is a prime.

It is a super-2 number, since 2×86108781² = 14829444330611922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86108761) 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, 1304646 + ... + 1304711.

It is an arithmetic number, because the mean of its divisors is an integer number (15656148).

Almost surely, 2^86108781 is an apocalyptic number.

It is an amenable number.

86108781 is a deficient number, since it is larger than the sum of its proper divisors (39140403).

86108781 is a wasteful number, since it uses less digits than its factorization.

86108781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2609371.

The product of its (nonzero) digits is 21504, while the sum is 39.

The square root of 86108781 is about 9279.4817204411. The cubic root of 86108781 is about 441.5865263083.

It can be divided in two parts, 861087 and 81, that added together give a palindrome (861168).

The spelling of 86108781 in words is "eighty-six million, one hundred eight thousand, seven hundred eighty-one".