86369781 has 12 divisors (see below), whose sum is σ = 115900512. Its totient is φ = 57211704.

The previous prime is 86369753. The next prime is 86369797. The reversal of 86369781 is 18796368.

It is not a de Polignac number, because 86369781 - 2⁷ = 86369653 is a prime.

It is a super-2 number, since 2×86369781² = 14919478139975922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 86369781.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86369711) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 118440 + ... + 119166.

It is an arithmetic number, because the mean of its divisors is an integer number (9658376).

Almost surely, 2^86369781 is an apocalyptic number.

It is an amenable number.

86369781 is a deficient number, since it is larger than the sum of its proper divisors (29530731).

86369781 is an equidigital number, since it uses as much as digits as its factorization.

86369781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1128 (or 929 counting only the distinct ones).

The product of its digits is 435456, while the sum is 48.

The square root of 86369781 is about 9293.5343653532. The cubic root of 86369781 is about 442.0322332028.

The spelling of 86369781 in words is "eighty-six million, three hundred sixty-nine thousand, seven hundred eighty-one".