81584092 has 24 divisors (see below), whose sum is σ = 144520992. Its totient is φ = 40296000.

The previous prime is 81584077. The next prime is 81584093. The reversal of 81584092 is 29048518.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81584093) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 176742 + ... + 177202.

It is an arithmetic number, because the mean of its divisors is an integer number (6021708).

Almost surely, 2^81584092 is an apocalyptic number.

It is an amenable number.

81584092 is a deficient number, since it is larger than the sum of its proper divisors (62936900).

81584092 is a wasteful number, since it uses less digits than its factorization.

81584092 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 909 (or 907 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 37.

The square root of 81584092 is about 9032.3912669902. The cubic root of 81584092 is about 433.7123891680.

The spelling of 81584092 in words is "eighty-one million, five hundred eighty-four thousand, ninety-two".