80861818 has 8 divisors (see below), whose sum is σ = 121970880. Its totient is φ = 40204860.

The previous prime is 80861797. The next prime is 80861821. The reversal of 80861818 is 81816808.

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

It is a super-2 number, since 2×80861818² = 13077267220530248, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 112578 + ... + 113293.

It is an arithmetic number, because the mean of its divisors is an integer number (15246360).

Almost surely, 2^80861818 is an apocalyptic number.

80861818 is a deficient number, since it is larger than the sum of its proper divisors (41109062).

80861818 is a wasteful number, since it uses less digits than its factorization.

80861818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226052.

The product of its (nonzero) digits is 24576, while the sum is 40.

The square root of 80861818 is about 8992.3199453756. The cubic root of 80861818 is about 432.4286903939.

It can be divided in two parts, 808 and 61818, that added together give a palindrome (62626).

The spelling of 80861818 in words is "eighty million, eight hundred sixty-one thousand, eight hundred eighteen".