81120828 has 24 divisors (see below), whose sum is σ = 189629440. Its totient is φ = 26990640.

The previous prime is 81120827. The next prime is 81120829. The reversal of 81120828 is 82802118.

It is an interprime number because it is at equal distance from previous prime (81120827) and next prime (81120829).

It is a junction number, because it is equal to n+sod(n) for n = 81120795 and 81120804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81120827) 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, 933 + ... + 12771.

Almost surely, 2^81120828 is an apocalyptic number.

It is an amenable number.

81120828 is an abundant number, since it is smaller than the sum of its proper divisors (108508612).

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

81120828 is a wasteful number, since it uses less digits than its factorization.

81120828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12417 (or 12415 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 30.

The square root of 81120828 is about 9006.7101652046. The cubic root of 81120828 is about 432.8899051079.

The spelling of 81120828 in words is "eighty-one million, one hundred twenty thousand, eight hundred twenty-eight".