81489828 has 48 divisors (see below), whose sum is σ = 226759680. Its totient is φ = 22269984.

The previous prime is 81489791. The next prime is 81489833. The reversal of 81489828 is 82898418.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19158 + ... + 23021.

It is an arithmetic number, because the mean of its divisors is an integer number (4724160).

Almost surely, 2^81489828 is an apocalyptic number.

It is an amenable number.

81489828 is an abundant number, since it is smaller than the sum of its proper divisors (145269852).

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

81489828 is a wasteful number, since it uses less digits than its factorization.

81489828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42216 (or 42214 counting only the distinct ones).

The product of its digits is 294912, while the sum is 48.

The square root of 81489828 is about 9027.1716500796. The cubic root of 81489828 is about 433.5452846110.

The spelling of 81489828 in words is "eighty-one million, four hundred eighty-nine thousand, eight hundred twenty-eight".