78804559 has 2 divisors, whose sum is σ = 78804560. Its totient is φ = 78804558.

The previous prime is 78804553. The next prime is 78804611. The reversal of 78804559 is 95540887.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78804559 - 2⁵ = 78804527 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78804553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39402279 + 39402280.

It is an arithmetic number, because the mean of its divisors is an integer number (39402280).

Almost surely, 2^78804559 is an apocalyptic number.

78804559 is a deficient number, since it is larger than the sum of its proper divisors (1).

78804559 is an equidigital number, since it uses as much as digits as its factorization.

78804559 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 403200, while the sum is 46.

The square root of 78804559 is about 8877.1931937972. The cubic root of 78804559 is about 428.7299082517.

The spelling of 78804559 in words is "seventy-eight million, eight hundred four thousand, five hundred fifty-nine".