86644391 has 8 divisors (see below), whose sum is σ = 88454400. Its totient is φ = 84845880.

The previous prime is 86644331. The next prime is 86644403. The reversal of 86644391 is 19344668.

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 86644391 - 2¹⁰ = 86643367 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86644331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13280 + ... + 18698.

It is an arithmetic number, because the mean of its divisors is an integer number (11056800).

Almost surely, 2^86644391 is an apocalyptic number.

86644391 is a deficient number, since it is larger than the sum of its proper divisors (1810009).

86644391 is a wasteful number, since it uses less digits than its factorization.

86644391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5749.

The product of its digits is 124416, while the sum is 41.

The square root of 86644391 is about 9308.2968904091. The cubic root of 86644391 is about 442.5002134337.

The spelling of 86644391 in words is "eighty-six million, six hundred forty-four thousand, three hundred ninety-one".