81359742 has 16 divisors (see below), whose sum is σ = 164331792. Its totient is φ = 26851200.

The previous prime is 81359737. The next prime is 81359743. The reversal of 81359742 is 24795318.

It is a self number, because there is not a number n which added to its sum of digits gives 81359742.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81359743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66523 + ... + 67734.

It is an arithmetic number, because the mean of its divisors is an integer number (10270737).

Almost surely, 2^81359742 is an apocalyptic number.

81359742 is an abundant number, since it is smaller than the sum of its proper divisors (82972050).

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

81359742 is a wasteful number, since it uses less digits than its factorization.

81359742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134363.

The product of its digits is 60480, while the sum is 39.

The square root of 81359742 is about 9019.9635254251. The cubic root of 81359742 is about 433.3144655822.

The spelling of 81359742 in words is "eighty-one million, three hundred fifty-nine thousand, seven hundred forty-two".