81535722 has 16 divisors (see below), whose sum is σ = 163170912. Its totient is φ = 27162000.

The previous prime is 81535693. The next prime is 81535763. The reversal of 81535722 is 22753518.

It is a super-2 number, since 2×81535722² = 13296147924122568, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10488 + ... + 16524.

It is an arithmetic number, because the mean of its divisors is an integer number (10198182).

Almost surely, 2^81535722 is an apocalyptic number.

81535722 is an abundant number, since it is smaller than the sum of its proper divisors (81635190).

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

81535722 is a wasteful number, since it uses less digits than its factorization.

81535722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8293.

The product of its digits is 16800, while the sum is 33.

The square root of 81535722 is about 9029.7132844847. The cubic root of 81535722 is about 433.6266583386.

The spelling of 81535722 in words is "eighty-one million, five hundred thirty-five thousand, seven hundred twenty-two".