81080742 has 16 divisors (see below), whose sum is σ = 162250560. Its totient is φ = 27012072.

The previous prime is 81080719. The next prime is 81080749. The reversal of 81080742 is 24708018.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81080749) 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, 17109 + ... + 21327.

It is an arithmetic number, because the mean of its divisors is an integer number (10140660).

Almost surely, 2^81080742 is an apocalyptic number.

81080742 is an abundant number, since it is smaller than the sum of its proper divisors (81169818).

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

81080742 is a wasteful number, since it uses less digits than its factorization.

81080742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7427.

The product of its (nonzero) digits is 3584, while the sum is 30.

The square root of 81080742 is about 9004.4845493787. The cubic root of 81080742 is about 432.8185889233.

The spelling of 81080742 in words is "eighty-one million, eighty thousand, seven hundred forty-two".