81844806 has 32 divisors (see below), whose sum is σ = 166924800. Its totient is φ = 26747744.

The previous prime is 81844801. The next prime is 81844843. The reversal of 81844806 is 60844818.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81844801) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 73651 + ... + 74753.

It is an arithmetic number, because the mean of its divisors is an integer number (5216400).

Almost surely, 2^81844806 is an apocalyptic number.

81844806 is an abundant number, since it is smaller than the sum of its proper divisors (85079994).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81844806 is a wasteful number, since it uses less digits than its factorization.

81844806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1340.

The product of its (nonzero) digits is 49152, while the sum is 39.

The square root of 81844806 is about 9046.8119246506. The cubic root of 81844806 is about 434.1738952177.

The spelling of 81844806 in words is "eighty-one million, eight hundred forty-four thousand, eight hundred six".