78995899 has 4 divisors (see below), whose sum is σ = 79080264. Its totient is φ = 78911536.

The previous prime is 78995857. The next prime is 78995921. The reversal of 78995899 is 99859987.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99859987 = 5153 ⋅19379.

It is a cyclic number.

It is not a de Polignac number, because 78995899 - 2¹⁷ = 78864827 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 78995899.

It is not an unprimeable number, because it can be changed into a prime (78995809) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40762 + ... + 42655.

It is an arithmetic number, because the mean of its divisors is an integer number (19770066).

Almost surely, 2^78995899 is an apocalyptic number.

78995899 is a deficient number, since it is larger than the sum of its proper divisors (84365).

78995899 is an equidigital number, since it uses as much as digits as its factorization.

78995899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84364.

The product of its digits is 14696640, while the sum is 64.

The square root of 78995899 is about 8887.9637150474. The cubic root of 78995899 is about 429.0766177908.

The spelling of 78995899 in words is "seventy-eight million, nine hundred ninety-five thousand, eight hundred ninety-nine".