81327522 has 16 divisors (see below), whose sum is σ = 162832320. Its totient is φ = 27079632.

The previous prime is 81327509. The next prime is 81327529. The reversal of 81327522 is 22572318.

It is a super-2 number, since 2×81327522² = 13228331669320968, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 81327522.

It is not an unprimeable number, because it can be changed into a prime (81327529) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 997 + ... + 12792.

It is an arithmetic number, because the mean of its divisors is an integer number (10177020).

Almost surely, 2^81327522 is an apocalyptic number.

81327522 is an abundant number, since it is smaller than the sum of its proper divisors (81504798).

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

81327522 is a wasteful number, since it uses less digits than its factorization.

81327522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14777.

The product of its digits is 6720, while the sum is 30.

The square root of 81327522 is about 9018.1773102995. The cubic root of 81327522 is about 433.2572577824.

The spelling of 81327522 in words is "eighty-one million, three hundred twenty-seven thousand, five hundred twenty-two".