86647481 has 6 divisors (see below), whose sum is σ = 87559470. Its totient is φ = 85744896.

The previous prime is 86647471. The next prime is 86647493. The reversal of 86647481 is 18474668.

It can be written as a sum of positive squares in 3 ways, for example, as 1915456 + 84732025 = 1384^2 + 9205^2 .

It is not a de Polignac number, because 86647481 - 2¹⁸ = 86385337 is a prime.

It is a super-2 number, since 2×86647481² = 15015571927290722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (86647441) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4805 + ... + 14013.

It is an arithmetic number, because the mean of its divisors is an integer number (14593245).

Almost surely, 2^86647481 is an apocalyptic number.

It is an amenable number.

86647481 is a deficient number, since it is larger than the sum of its proper divisors (911989).

86647481 is an frugal number, since it uses more digits than its factorization.

86647481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9403 (or 9306 counting only the distinct ones).

The product of its digits is 258048, while the sum is 44.

The square root of 86647481 is about 9308.4628698835. The cubic root of 86647481 is about 442.5054736680.

The spelling of 86647481 in words is "eighty-six million, six hundred forty-seven thousand, four hundred eighty-one".