81044668 has 12 divisors (see below), whose sum is σ = 142154320. Its totient is φ = 40429152.

The previous prime is 81044657. The next prime is 81044683. The reversal of 81044668 is 86644018.

It is a super-2 number, since 2×81044668² = 13136476422460448, which contains 22 as substring.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21321 + ... + 24832.

Almost surely, 2^81044668 is an apocalyptic number.

It is an amenable number.

81044668 is a deficient number, since it is larger than the sum of its proper divisors (61109652).

81044668 is a wasteful number, since it uses less digits than its factorization.

81044668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46596 (or 46594 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 37.

The square root of 81044668 is about 9002.4812135322. The cubic root of 81044668 is about 432.7543903087.

The spelling of 81044668 in words is "eighty-one million, forty-four thousand, six hundred sixty-eight".