81324742 has 16 divisors (see below), whose sum is σ = 125637120. Its totient is φ = 39451968.

The previous prime is 81324721. The next prime is 81324751. The reversal of 81324742 is 24742318.

It is a super-2 number, since 2×81324742² = 13227427322733128, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28923 + ... + 31609.

It is an arithmetic number, because the mean of its divisors is an integer number (7852320).

Almost surely, 2^81324742 is an apocalyptic number.

81324742 is a deficient number, since it is larger than the sum of its proper divisors (44312378).

81324742 is a wasteful number, since it uses less digits than its factorization.

81324742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3135.

The product of its digits is 10752, while the sum is 31.

The square root of 81324742 is about 9018.0231758407. The cubic root of 81324742 is about 433.2523210818.

The spelling of 81324742 in words is "eighty-one million, three hundred twenty-four thousand, seven hundred forty-two".