87865823 has 4 divisors (see below), whose sum is σ = 92490360. Its totient is φ = 83241288.

The previous prime is 87865807. The next prime is 87865847. The reversal of 87865823 is 32856878.

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 87865823 - 2⁴ = 87865807 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 (87865123) 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, 2312240 + ... + 2312277.

It is an arithmetic number, because the mean of its divisors is an integer number (23122590).

Almost surely, 2^87865823 is an apocalyptic number.

87865823 is a deficient number, since it is larger than the sum of its proper divisors (4624537).

87865823 is a wasteful number, since it uses less digits than its factorization.

87865823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4624536.

The product of its digits is 645120, while the sum is 47.

The square root of 87865823 is about 9373.6771333346. The cubic root of 87865823 is about 444.5698372279.

It can be divided in two parts, 87865 and 823, that added together give a palindrome (88688).

The spelling of 87865823 in words is "eighty-seven million, eight hundred sixty-five thousand, eight hundred twenty-three".