80687881 has 4 divisors (see below), whose sum is σ = 80774932. Its totient is φ = 80600832.

The previous prime is 80687857. The next prime is 80687891. The reversal of 80687881 is 18878608.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1121481 + 79566400 = 1059^2 + 8920^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-80687881 is a prime.

It is a super-2 number, since 2×80687881² = 13021068280540322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (80687891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42120 + ... + 43993.

It is an arithmetic number, because the mean of its divisors is an integer number (20193733).

It is a Poulet number, since it divides 2^80687880-1.

Almost surely, 2^80687881 is an apocalyptic number.

It is an amenable number.

80687881 is a deficient number, since it is larger than the sum of its proper divisors (87051).

80687881 is an equidigital number, since it uses as much as digits as its factorization.

80687881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87050.

The product of its (nonzero) digits is 172032, while the sum is 46.

The square root of 80687881 is about 8982.6433192018. The cubic root of 80687881 is about 432.1184106850.

The spelling of 80687881 in words is "eighty million, six hundred eighty-seven thousand, eight hundred eighty-one".