81363742 has 16 divisors (see below), whose sum is σ = 127550880. Its totient is φ = 38852352.

The previous prime is 81363727. The next prime is 81363743. The reversal of 81363742 is 24736318.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 81363698 and 81363707.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81363743) by changing a digit.

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, 45538 + ... + 47290.

It is an arithmetic number, because the mean of its divisors is an integer number (7971930).

Almost surely, 2^81363742 is an apocalyptic number.

81363742 is a deficient number, since it is larger than the sum of its proper divisors (46187138).

81363742 is a wasteful number, since it uses less digits than its factorization.

81363742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2787.

The product of its digits is 24192, while the sum is 34.

The square root of 81363742 is about 9020.1852530865. The cubic root of 81363742 is about 433.3215666759.

The spelling of 81363742 in words is "eighty-one million, three hundred sixty-three thousand, seven hundred forty-two".