81589748 has 12 divisors (see below), whose sum is σ = 146102880. Its totient is φ = 39846072.

The previous prime is 81589733. The next prime is 81589759. The reversal of 81589748 is 84798518.

It is a junction number, because it is equal to n+sod(n) for n = 81589696 and 81589705.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 237008 + ... + 237351.

It is an arithmetic number, because the mean of its divisors is an integer number (12175240).

Almost surely, 2^81589748 is an apocalyptic number.

It is an amenable number.

81589748 is a deficient number, since it is larger than the sum of its proper divisors (64513132).

81589748 is a wasteful number, since it uses less digits than its factorization.

81589748 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 474406 (or 474404 counting only the distinct ones).

The product of its digits is 645120, while the sum is 50.

The square root of 81589748 is about 9032.7043569465. The cubic root of 81589748 is about 433.7224116308.

The spelling of 81589748 in words is "eighty-one million, five hundred eighty-nine thousand, seven hundred forty-eight".