81372 has 12 divisors (see below), whose sum is σ = 189896. Its totient is φ = 27120.

The previous prime is 81371. The next prime is 81373. The reversal of 81372 is 27318.

It is an interprime number because it is at equal distance from previous prime (81371) and next prime (81373).

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81371) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3379 + ... + 3402.

2⁸¹³⁷² is an apocalyptic number.

It is an amenable number.

81372 is an abundant number, since it is smaller than the sum of its proper divisors (108524).

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

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (94948).

81372 is a wasteful number, since it uses less digits than its factorization.

81372 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6788 (or 6786 counting only the distinct ones).

The product of its digits is 336, while the sum is 21.

The square root of 81372 is about 285.2577781586. The cubic root of 81372 is about 43.3336226148. Note that the first 3 decimals are identical.

The spelling of 81372 in words is "eighty-one thousand, three hundred seventy-two".