80081920 has 44 divisors (see below), whose sum is σ = 192115044. Its totient is φ = 32030720.

The previous prime is 80081899. The next prime is 80081921. The reversal of 80081920 is 2918008.

It can be written as a sum of positive squares in 2 ways, for example, as 61968384 + 18113536 = 7872^2 + 4256^2 .

It is a super-2 number, since 2×80081920² = 12826227821772800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80081921) 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, 2701 + ... + 12940.

It is an arithmetic number, because the mean of its divisors is an integer number (4366251).

Almost surely, 2^80081920 is an apocalyptic number.

80081920 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

80081920 is an abundant number, since it is smaller than the sum of its proper divisors (112033124).

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

80081920 is a wasteful number, since it uses less digits than its factorization.

80081920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15666 (or 15648 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 28.

The square root of 80081920 is about 8948.8502054733. The cubic root of 80081920 is about 431.0339639078.

Adding to 80081920 its reverse (2918008), we get a palindrome (82999928).

The spelling of 80081920 in words is "eighty million, eighty-one thousand, nine hundred twenty".