80891818 has 8 divisors (see below), whose sum is σ = 138671712. Its totient is φ = 34667916.

The previous prime is 80891753. The next prime is 80891819. The reversal of 80891818 is 81819808.

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 (80891819) 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, 2888980 + ... + 2889007.

It is an arithmetic number, because the mean of its divisors is an integer number (17333964).

Almost surely, 2^80891818 is an apocalyptic number.

80891818 is a deficient number, since it is larger than the sum of its proper divisors (57779894).

80891818 is a wasteful number, since it uses less digits than its factorization.

80891818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5777996.

The product of its (nonzero) digits is 36864, while the sum is 43.

The square root of 80891818 is about 8993.9878808013. The cubic root of 80891818 is about 432.4821612699.

The spelling of 80891818 in words is "eighty million, eight hundred ninety-one thousand, eight hundred eighteen".