80745820 has 48 divisors (see below), whose sum is σ = 180311040. Its totient is φ = 30286656.

The previous prime is 80745809. The next prime is 80745827. The reversal of 80745820 is 2854708.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80745827) 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, 38109 + ... + 40171.

It is an arithmetic number, because the mean of its divisors is an integer number (3756480).

Almost surely, 2^80745820 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 80745820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (90155520).

80745820 is an abundant number, since it is smaller than the sum of its proper divisors (99565220).

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

80745820 is a wasteful number, since it uses less digits than its factorization.

80745820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2194 (or 2192 counting only the distinct ones).

The product of its (nonzero) digits is 17920, while the sum is 34.

The square root of 80745820 is about 8985.8677933742. The cubic root of 80745820 is about 432.2218153850.

The spelling of 80745820 in words is "eighty million, seven hundred forty-five thousand, eight hundred twenty".