81760028 has 72 divisors (see below), whose sum is σ = 173804400. Its totient is φ = 33530112.

The previous prime is 81760013. The next prime is 81760037. The reversal of 81760028 is 82006718.

It is a junction number, because it is equal to n+sod(n) for n = 81759976 and 81760003.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 750038 + ... + 750146.

It is an arithmetic number, because the mean of its divisors is an integer number (2413950).

Almost surely, 2^81760028 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 81760028, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86902200).

81760028 is an abundant number, since it is smaller than the sum of its proper divisors (92044372).

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

81760028 is a wasteful number, since it uses less digits than its factorization.

81760028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 259 (or 250 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 32.

The square root of 81760028 is about 9042.1251926746. The cubic root of 81760028 is about 434.0239320830.

The spelling of 81760028 in words is "eighty-one million, seven hundred sixty thousand, twenty-eight".