86665787 has 4 divisors (see below), whose sum is σ = 93332400. Its totient is φ = 79999176.

The previous prime is 86665781. The next prime is 86665829. The reversal of 86665787 is 78756668.

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 86665787 - 2¹⁰ = 86664763 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (86665781) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3333287 + ... + 3333312.

It is an arithmetic number, because the mean of its divisors is an integer number (23333100).

Almost surely, 2^86665787 is an apocalyptic number.

86665787 is a deficient number, since it is larger than the sum of its proper divisors (6666613).

86665787 is a wasteful number, since it uses less digits than its factorization.

86665787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6666612.

The product of its digits is 3386880, while the sum is 53.

The square root of 86665787 is about 9309.4461167139. The cubic root of 86665787 is about 442.5366341615.

The spelling of 86665787 in words is "eighty-six million, six hundred sixty-five thousand, seven hundred eighty-seven".