78919199 has 4 divisors (see below), whose sum is σ = 79219536. Its totient is φ = 78618864.

The previous prime is 78919193. The next prime is 78919201. The reversal of 78919199 is 99191987.

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 78919199 - 2¹² = 78915103 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 78919199.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78919193) 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, 149774 + ... + 150299.

It is an arithmetic number, because the mean of its divisors is an integer number (19804884).

Almost surely, 2^78919199 is an apocalyptic number.

78919199 is a deficient number, since it is larger than the sum of its proper divisors (300337).

78919199 is a wasteful number, since it uses less digits than its factorization.

78919199 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 300336.

The product of its digits is 367416, while the sum is 53.

The square root of 78919199 is about 8883.6478430879. The cubic root of 78919199 is about 428.9377041088.

The spelling of 78919199 in words is "seventy-eight million, nine hundred nineteen thousand, one hundred ninety-nine".