81122844 has 48 divisors (see below), whose sum is σ = 218647296. Its totient is φ = 23136000.

The previous prime is 81122819. The next prime is 81122869. The reversal of 81122844 is 44822118.

It is an interprime number because it is at equal distance from previous prime (81122819) and next prime (81122869).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15832 + ... + 20319.

It is an arithmetic number, because the mean of its divisors is an integer number (4555152).

Almost surely, 2^81122844 is an apocalyptic number.

It is an amenable number.

81122844 is an abundant number, since it is smaller than the sum of its proper divisors (137524452).

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

81122844 is a wasteful number, since it uses less digits than its factorization.

81122844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36186 (or 36184 counting only the distinct ones).

The product of its digits is 4096, while the sum is 30.

The square root of 81122844 is about 9006.8220810672. The cubic root of 81122844 is about 432.8934911118.

The spelling of 81122844 in words is "eighty-one million, one hundred twenty-two thousand, eight hundred forty-four".