80857728 has 192 divisors, whose sum is σ = 274110720. Its totient is φ = 22394880.

The previous prime is 80857727. The next prime is 80857741. The reversal of 80857728 is 82775808.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (192).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80857723) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 298233 + ... + 298503.

It is an arithmetic number, because the mean of its divisors is an integer number (1427660).

Almost surely, 2^80857728 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 80857728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (137055360).

80857728 is an abundant number, since it is smaller than the sum of its proper divisors (193252992).

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

80857728 is a wasteful number, since it uses less digits than its factorization.

80857728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 335 (or 320 counting only the distinct ones).

The product of its (nonzero) digits is 250880, while the sum is 45.

The square root of 80857728 is about 8992.0925262144. The cubic root of 80857728 is about 432.4213995068.

The spelling of 80857728 in words is "eighty million, eight hundred fifty-seven thousand, seven hundred twenty-eight".