78008999 has 4 divisors (see below), whose sum is σ = 78046080. Its totient is φ = 77971920.

The previous prime is 78008993. The next prime is 78009023. The reversal of 78008999 is 99980087.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78008999 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78008993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15182 + ... + 19659.

It is an arithmetic number, because the mean of its divisors is an integer number (19511520).

Almost surely, 2^78008999 is an apocalyptic number.

78008999 is a deficient number, since it is larger than the sum of its proper divisors (37081).

78008999 is a wasteful number, since it uses less digits than its factorization.

78008999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37080.

The product of its (nonzero) digits is 326592, while the sum is 50.

The square root of 78008999 is about 8832.2703196856. The cubic root of 78008999 is about 427.2822990146.

The spelling of 78008999 in words is "seventy-eight million, eight thousand, nine hundred ninety-nine".