81227028 has 48 divisors (see below), whose sum is σ = 198092160. Its totient is φ = 25872000.

The previous prime is 81227021. The next prime is 81227039. The reversal of 81227028 is 82072218.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 81226986 and 81227004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81227021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33993 + ... + 36303.

It is an arithmetic number, because the mean of its divisors is an integer number (4126920).

Almost surely, 2^81227028 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81227028, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (99046080).

81227028 is an abundant number, since it is smaller than the sum of its proper divisors (116865132).

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

81227028 is a wasteful number, since it uses less digits than its factorization.

81227028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2448 (or 2446 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 30.

The square root of 81227028 is about 9012.6038412880. The cubic root of 81227028 is about 433.0787298594.

The spelling of 81227028 in words is "eighty-one million, two hundred twenty-seven thousand, twenty-eight".