86781481 has 8 divisors (see below), whose sum is σ = 91998720. Its totient is φ = 81576768.

The previous prime is 86781473. The next prime is 86781491. The reversal of 86781481 is 18418768.

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 86781481 - 2³ = 86781473 is a prime.

It is a super-2 number, since 2×86781481² = 15062050889106722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (86781491) 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, 13800 + ... + 19078.

It is an arithmetic number, because the mean of its divisors is an integer number (11499840).

Almost surely, 2^86781481 is an apocalyptic number.

It is an amenable number.

86781481 is a deficient number, since it is larger than the sum of its proper divisors (5217239).

86781481 is a wasteful number, since it uses less digits than its factorization.

86781481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6263.

The product of its digits is 86016, while the sum is 43.

The square root of 86781481 is about 9315.6578404319. The cubic root of 86781481 is about 442.7334671890.

The spelling of 86781481 in words is "eighty-six million, seven hundred eighty-one thousand, four hundred eighty-one".