86640247 has 4 divisors (see below), whose sum is σ = 91200280. Its totient is φ = 82080216.

The previous prime is 86640193. The next prime is 86640251. The reversal of 86640247 is 74204668.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 86640247 - 2¹⁹ = 86115959 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86640277) 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 3 ways as a sum of consecutive naturals, for example, 2279988 + ... + 2280025.

It is an arithmetic number, because the mean of its divisors is an integer number (22800070).

Almost surely, 2^86640247 is an apocalyptic number.

86640247 is a deficient number, since it is larger than the sum of its proper divisors (4560033).

86640247 is a wasteful number, since it uses less digits than its factorization.

86640247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4560032.

The product of its (nonzero) digits is 64512, while the sum is 37.

The square root of 86640247 is about 9308.0742906361. The cubic root of 86640247 is about 442.4931587353.

The spelling of 86640247 in words is "eighty-six million, six hundred forty thousand, two hundred forty-seven".