80865823 has 4 divisors (see below), whose sum is σ = 81973648. Its totient is φ = 79758000.

The previous prime is 80865797. The next prime is 80865857. The reversal of 80865823 is 32856808.

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 80865823 - 2⁵ = 80865791 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 (80865023) 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, 553803 + ... + 553948.

It is an arithmetic number, because the mean of its divisors is an integer number (20493412).

Almost surely, 2^80865823 is an apocalyptic number.

80865823 is a deficient number, since it is larger than the sum of its proper divisors (1107825).

80865823 is a wasteful number, since it uses less digits than its factorization.

80865823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1107824.

The product of its (nonzero) digits is 92160, while the sum is 40.

The square root of 80865823 is about 8992.5426326485. The cubic root of 80865823 is about 432.4358295207.

The spelling of 80865823 in words is "eighty million, eight hundred sixty-five thousand, eight hundred twenty-three".