81922336 has 48 divisors (see below), whose sum is σ = 167650560. Its totient is φ = 39363840.

The previous prime is 81922283. The next prime is 81922349. The reversal of 81922336 is 63322918.

It is a happy number.

It is a super-2 number, since 2×81922336² = 13422538271393792, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 266695 + ... + 267001.

It is an arithmetic number, because the mean of its divisors is an integer number (3492720).

Almost surely, 2^81922336 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81922336, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (83825280).

81922336 is an abundant number, since it is smaller than the sum of its proper divisors (85728224).

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

81922336 is a wasteful number, since it uses less digits than its factorization.

81922336 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 617 (or 609 counting only the distinct ones).

The product of its digits is 15552, while the sum is 34.

The square root of 81922336 is about 9051.0958452554. The cubic root of 81922336 is about 434.3109467927.

The spelling of 81922336 in words is "eighty-one million, nine hundred twenty-two thousand, three hundred thirty-six".