80851840 has 128 divisors (see below), whose sum is σ = 208692000. Its totient is φ = 29859840.

The previous prime is 80851817. The next prime is 80851843. The reversal of 80851840 is 4815808.

It is a tau number, because it is divible by the number of its divisors (128).

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 80851796 and 80851805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80851843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 741706 + ... + 741814.

Almost surely, 2^80851840 is an apocalyptic number.

80851840 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 80851840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (104346000).

80851840 is an abundant number, since it is smaller than the sum of its proper divisors (127840160).

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

80851840 is a wasteful number, since it uses less digits than its factorization.

80851840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208 (or 196 counting only the distinct ones).

The product of its (nonzero) digits is 10240, while the sum is 34.

The square root of 80851840 is about 8991.7651214875. The cubic root of 80851840 is about 432.4109030498.

The spelling of 80851840 in words is "eighty million, eight hundred fifty-one thousand, eight hundred forty".