81321676 has 12 divisors (see below), whose sum is σ = 150684408. Its totient is φ = 38268992.

The previous prime is 81321673. The next prime is 81321679. The reversal of 81321676 is 67612318.

It is an interprime number because it is at equal distance from previous prime (81321673) and next prime (81321679).

It is a super-2 number, since 2×81321676² = 13226429974897952, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is not an unprimeable number, because it can be changed into a prime (81321673) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 597886 + ... + 598021.

It is an arithmetic number, because the mean of its divisors is an integer number (12557034).

Almost surely, 2^81321676 is an apocalyptic number.

It is an amenable number.

81321676 is a deficient number, since it is larger than the sum of its proper divisors (69362732).

81321676 is a wasteful number, since it uses less digits than its factorization.

81321676 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1195928 (or 1195926 counting only the distinct ones).

The product of its digits is 12096, while the sum is 34.

The square root of 81321676 is about 9017.8531813287. The cubic root of 81321676 is about 433.2468763742.

The spelling of 81321676 in words is "eighty-one million, three hundred twenty-one thousand, six hundred seventy-six".