81844627 has 4 divisors (see below), whose sum is σ = 81876096. Its totient is φ = 81813160.

The previous prime is 81844601. The next prime is 81844673. The reversal of 81844627 is 72644818.

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 81844627 - 2¹⁵ = 81811859 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 81844627.

It is not an unprimeable number, because it can be changed into a prime (81844687) by changing a digit.

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, 11443 + ... + 17164.

It is an arithmetic number, because the mean of its divisors is an integer number (20469024).

Almost surely, 2^81844627 is an apocalyptic number.

81844627 is the 5722-nd heptagonal number.

81844627 is a deficient number, since it is larger than the sum of its proper divisors (31469).

81844627 is a wasteful number, since it uses less digits than its factorization.

81844627 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31468.

The product of its digits is 86016, while the sum is 40.

The square root of 81844627 is about 9046.8020316574. The cubic root of 81844627 is about 434.1735786951.

The spelling of 81844627 in words is "eighty-one million, eight hundred forty-four thousand, six hundred twenty-seven".