81014742 has 48 divisors (see below), whose sum is σ = 184176720. Its totient is φ = 26687232.

The previous prime is 81014663. The next prime is 81014767. The reversal of 81014742 is 24741018.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 42318 + ... + 44190.

It is an arithmetic number, because the mean of its divisors is an integer number (3837015).

Almost surely, 2^81014742 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81014742, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (92088360).

81014742 is an abundant number, since it is smaller than the sum of its proper divisors (103161978).

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

81014742 is a wasteful number, since it uses less digits than its factorization.

81014742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1979 (or 1967 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 27.

The square root of 81014742 is about 9000.8189627389. The cubic root of 81014742 is about 432.7011184421.

The spelling of 81014742 in words is "eighty-one million, fourteen thousand, seven hundred forty-two".