80811720 has 96 divisors (see below), whose sum is σ = 286528320. Its totient is φ = 19589760.

The previous prime is 80811701. The next prime is 80811743. The reversal of 80811720 is 2711808.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 6244 + ... + 14163.

It is an arithmetic number, because the mean of its divisors is an integer number (2984670).

Almost surely, 2^80811720 is an apocalyptic number.

It is an amenable number.

80811720 is an abundant number, since it is smaller than the sum of its proper divisors (205716600).

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

80811720 is a wasteful number, since it uses less digits than its factorization.

80811720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20435 (or 20428 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 27.

The square root of 80811720 is about 8989.5339145030. The cubic root of 80811720 is about 432.3393681050.

It can be divided in two parts, 8081 and 1720, that added together give a square (9801 = 99²).

The spelling of 80811720 in words is "eighty million, eight hundred eleven thousand, seven hundred twenty".