80782789 has 2 divisors, whose sum is σ = 80782790. Its totient is φ = 80782788.

The previous prime is 80782787. The next prime is 80782829. The reversal of 80782789 is 98728708.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 67930564 + 12852225 = 8242^2 + 3585^2 .

It is a cyclic number.

It is not a de Polignac number, because 80782789 - 2¹ = 80782787 is a prime.

Together with 80782787, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (80782783) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40391394 + 40391395.

It is an arithmetic number, because the mean of its divisors is an integer number (40391395).

Almost surely, 2^80782789 is an apocalyptic number.

It is an amenable number.

80782789 is a deficient number, since it is larger than the sum of its proper divisors (1).

80782789 is an equidigital number, since it uses as much as digits as its factorization.

80782789 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 451584, while the sum is 49.

The square root of 80782789 is about 8987.9246214018. The cubic root of 80782789 is about 432.2877687281.

The spelling of 80782789 in words is "eighty million, seven hundred eighty-two thousand, seven hundred eighty-nine".