78888559 has 2 divisors, whose sum is σ = 78888560. Its totient is φ = 78888558.

The previous prime is 78888527. The next prime is 78888587. The reversal of 78888559 is 95588887.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78888559 - 2⁵ = 78888527 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78888599) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39444279 + 39444280.

It is an arithmetic number, because the mean of its divisors is an integer number (39444280).

Almost surely, 2^78888559 is an apocalyptic number.

78888559 is a deficient number, since it is larger than the sum of its proper divisors (1).

78888559 is an equidigital number, since it uses as much as digits as its factorization.

78888559 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6451200, while the sum is 58.

The square root of 78888559 is about 8881.9231588660. The cubic root of 78888559 is about 428.8821859221.

The spelling of 78888559 in words is "seventy-eight million, eight hundred eighty-eight thousand, five hundred fifty-nine".