81372282 has 8 divisors (see below), whose sum is σ = 162744576. Its totient is φ = 27124092.

The previous prime is 81372281. The next prime is 81372283. The reversal of 81372282 is 28227318.

It is an interprime number because it is at equal distance from previous prime (81372281) and next prime (81372283).

It is a sphenic number, since it is the product of 3 distinct primes.

81372282 is an admirable number.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (81372281) 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, 6781018 + ... + 6781029.

It is an arithmetic number, because the mean of its divisors is an integer number (20343072).

Almost surely, 2^81372282 is an apocalyptic number.

81372282 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

81372282 is a wasteful number, since it uses less digits than its factorization.

81372282 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13562052.

The product of its digits is 10752, while the sum is 33.

The square root of 81372282 is about 9020.6586234044. The cubic root of 81372282 is about 433.3367267321.

The spelling of 81372282 in words is "eighty-one million, three hundred seventy-two thousand, two hundred eighty-two".