81322076 has 24 divisors (see below), whose sum is σ = 155915760. Its totient is φ = 36806400.

The previous prime is 81322063. The next prime is 81322097. The reversal of 81322076 is 67022318.

It is a happy number.

It is a super-2 number, since 2×81322076² = 13226560089899552, which contains 22 as substring.

It is a congruent number.

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, 6770 + ... + 14438.

It is an arithmetic number, because the mean of its divisors is an integer number (6496490).

Almost surely, 2^81322076 is an apocalyptic number.

It is an amenable number.

81322076 is a deficient number, since it is larger than the sum of its proper divisors (74593684).

81322076 is a wasteful number, since it uses less digits than its factorization.

81322076 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7925 (or 7923 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 81322076 is about 9017.8753595290. The cubic root of 81322076 is about 433.2475867156.

The spelling of 81322076 in words is "eighty-one million, three hundred twenty-two thousand, seventy-six".