80767681 has 4 divisors (see below), whose sum is σ = 80975700. Its totient is φ = 80559664.

The previous prime is 80767669. The next prime is 80767691. The reversal of 80767681 is 18676708.

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 43362225 + 37405456 = 6585^2 + 6116^2 .

It is a cyclic number.

It is not a de Polignac number, because 80767681 - 2⁵ = 80767649 is a prime.

It is a super-2 number, since 2×80767681² = 13046836588235522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (80767691) 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 3 ways as a sum of consecutive naturals, for example, 103426 + ... + 104203.

It is an arithmetic number, because the mean of its divisors is an integer number (20243925).

Almost surely, 2^80767681 is an apocalyptic number.

It is an amenable number.

80767681 is a deficient number, since it is larger than the sum of its proper divisors (208019).

80767681 is a wasteful number, since it uses less digits than its factorization.

80767681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208018.

The product of its (nonzero) digits is 112896, while the sum is 43.

The square root of 80767681 is about 8987.0841211151. The cubic root of 80767681 is about 432.2608182234.

The spelling of 80767681 in words is "eighty million, seven hundred sixty-seven thousand, six hundred eighty-one".