80105680 has 20 divisors (see below), whose sum is σ = 186245892. Its totient is φ = 32042240.

The previous prime is 80105671. The next prime is 80105687. The reversal of 80105680 is 8650108.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 21307456 + 58798224 = 4616^2 + 7668^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80105687) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 500581 + ... + 500740.

Almost surely, 2^80105680 is an apocalyptic number.

80105680 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

80105680 is an abundant number, since it is smaller than the sum of its proper divisors (106140212).

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

80105680 is a wasteful number, since it uses less digits than its factorization.

80105680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1001334 (or 1001328 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 28.

The square root of 80105680 is about 8950.1776518681. The cubic root of 80105680 is about 431.0765884032.

Adding to 80105680 its reverse (8650108), we get a palindrome (88755788).

The spelling of 80105680 in words is "eighty million, one hundred five thousand, six hundred eighty".