78388859 has 2 divisors, whose sum is σ = 78388860. Its totient is φ = 78388858.

The previous prime is 78388837. The next prime is 78388873. The reversal of 78388859 is 95888387.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78388859 - 2¹² = 78384763 is a prime.

It is a super-2 number, since 2×78388859² = 12289626430643762, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78388159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39194429 + 39194430.

It is an arithmetic number, because the mean of its divisors is an integer number (39194430).

Almost surely, 2^78388859 is an apocalyptic number.

78388859 is a deficient number, since it is larger than the sum of its proper divisors (1).

78388859 is an equidigital number, since it uses as much as digits as its factorization.

78388859 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3870720, while the sum is 56.

The square root of 78388859 is about 8853.7483022729. The cubic root of 78388859 is about 427.9747179144.

The spelling of 78388859 in words is "seventy-eight million, three hundred eighty-eight thousand, eight hundred fifty-nine".