80067781 has 2 divisors, whose sum is σ = 80067782. Its totient is φ = 80067780.

The previous prime is 80067751. The next prime is 80067797. The reversal of 80067781 is 18776008.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 80013025 + 54756 = 8945^2 + 234^2 .

It is a cyclic number.

It is not a de Polignac number, because 80067781 - 2¹⁵ = 80035013 is a prime.

It is a super-3 number, since 3×80067781³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 80067781.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (80067721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40033890 + 40033891.

It is an arithmetic number, because the mean of its divisors is an integer number (40033891).

Almost surely, 2^80067781 is an apocalyptic number.

It is an amenable number.

80067781 is a deficient number, since it is larger than the sum of its proper divisors (1).

80067781 is an equidigital number, since it uses as much as digits as its factorization.

80067781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18816, while the sum is 37.

The square root of 80067781 is about 8948.0601808437. The cubic root of 80067781 is about 431.0085951024.

The spelling of 80067781 in words is "eighty million, sixty-seven thousand, seven hundred eighty-one".