78008899 has 4 divisors (see below), whose sum is σ = 78072120. Its totient is φ = 77945680.

The previous prime is 78008897. The next prime is 78008921. The reversal of 78008899 is 99880087.

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

It is a cyclic number.

It is not a de Polignac number, because 78008899 - 2¹ = 78008897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78008891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29722 + ... + 32239.

It is an arithmetic number, because the mean of its divisors is an integer number (19518030).

Almost surely, 2^78008899 is an apocalyptic number.

78008899 is a deficient number, since it is larger than the sum of its proper divisors (63221).

78008899 is a wasteful number, since it uses less digits than its factorization.

78008899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63220.

The product of its (nonzero) digits is 290304, while the sum is 49.

The square root of 78008899 is about 8832.2646586252. The cubic root of 78008899 is about 427.2821164363.

The spelling of 78008899 in words is "seventy-eight million, eight thousand, eight hundred ninety-nine".