81322344 has 24 divisors (see below), whose sum is σ = 220248210. Its totient is φ = 27107424.

The previous prime is 81322313. The next prime is 81322357. The reversal of 81322344 is 44322318.

It can be written as a sum of positive squares in only one way, i.e., 56700900 + 24621444 = 7530^2 + 4962^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is a super-2 number, since 2×81322344² = 13226647267308672, which contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 564667 + ... + 564810.

Almost surely, 2^81322344 is an apocalyptic number.

It is an amenable number.

81322344 is an abundant number, since it is smaller than the sum of its proper divisors (138925866).

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

81322344 is a wasteful number, since it uses less digits than its factorization.

81322344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1129489 (or 1129482 counting only the distinct ones).

The product of its digits is 4608, while the sum is 27.

The square root of 81322344 is about 9017.8902188927. The cubic root of 81322344 is about 433.2480626431.

The spelling of 81322344 in words is "eighty-one million, three hundred twenty-two thousand, three hundred forty-four".