81744992 has 48 divisors (see below), whose sum is σ = 193616640. Its totient is φ = 33187968.

The previous prime is 81744983. The next prime is 81745003. The reversal of 81744992 is 29944718.

It is a congruent number.

It is an unprimeable number.

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, 5348 + ... + 13859.

It is an arithmetic number, because the mean of its divisors is an integer number (4033680).

Almost surely, 2^81744992 is an apocalyptic number.

It is an amenable number.

81744992 is an abundant number, since it is smaller than the sum of its proper divisors (111871648).

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

81744992 is a wasteful number, since it uses less digits than its factorization.

81744992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19243 (or 19235 counting only the distinct ones).

The product of its digits is 145152, while the sum is 44.

The square root of 81744992 is about 9041.2937127382. The cubic root of 81744992 is about 433.9973241993.

The spelling of 81744992 in words is "eighty-one million, seven hundred forty-four thousand, nine hundred ninety-two".