81589312 has 42 divisors (see below), whose sum is σ = 188344302. Its totient is φ = 34965504.

The previous prime is 81589301. The next prime is 81589327. The reversal of 81589312 is 21398518.

It can be written as a sum of positive squares in only one way, i.e., 76317696 + 5271616 = 8736^2 + 2296^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9873 + ... + 16144.

Almost surely, 2^81589312 is an apocalyptic number.

It is an amenable number.

81589312 is an abundant number, since it is smaller than the sum of its proper divisors (106754990).

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

81589312 is a wasteful number, since it uses less digits than its factorization.

81589312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26043 (or 26026 counting only the distinct ones).

The product of its digits is 17280, while the sum is 37.

The square root of 81589312 is about 9032.6802223925. The cubic root of 81589312 is about 433.7216390529.

The spelling of 81589312 in words is "eighty-one million, five hundred eighty-nine thousand, three hundred twelve".