80856500 has 96 divisors (see below), whose sum is σ = 188697600. Its totient is φ = 30201600.

The previous prime is 80856499. The next prime is 80856509. The reversal of 80856500 is 565808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80856509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 908456 + ... + 908544.

It is an arithmetic number, because the mean of its divisors is an integer number (1965600).

Almost surely, 2^80856500 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 80856500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (94348800).

80856500 is an abundant number, since it is smaller than the sum of its proper divisors (107841100).

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

80856500 is a wasteful number, since it uses less digits than its factorization.

80856500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210 (or 198 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 32.

The square root of 80856500 is about 8992.0242437396. The cubic root of 80856500 is about 432.4192104101.

The spelling of 80856500 in words is "eighty million, eight hundred fifty-six thousand, five hundred".