81823874 has 8 divisors (see below), whose sum is σ = 133893648. Its totient is φ = 37192660.

The previous prime is 81823871. The next prime is 81823913. The reversal of 81823874 is 47832818.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (81823871) 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, 1859612 + ... + 1859655.

It is an arithmetic number, because the mean of its divisors is an integer number (16736706).

Almost surely, 2^81823874 is an apocalyptic number.

81823874 is a deficient number, since it is larger than the sum of its proper divisors (52069774).

81823874 is a wasteful number, since it uses less digits than its factorization.

81823874 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3719280.

The product of its digits is 86016, while the sum is 41.

The square root of 81823874 is about 9045.6549790493. The cubic root of 81823874 is about 434.1368783997.

The spelling of 81823874 in words is "eighty-one million, eight hundred twenty-three thousand, eight hundred seventy-four".