78398017219 has 4 divisors (see below), whose sum is σ = 79091805096. Its totient is φ = 77704229344.

The previous prime is 78398017211. The next prime is 78398017223. The reversal of 78398017219 is 91271089387.

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 78398017219 - 2³ = 78398017211 is a prime.

It is a super-2 number, since 2×78398017219² (a number of 23 digits) contains 22 as substring.

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 78398017219.

It is not an unprimeable number, because it can be changed into a prime (78398017211) 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, 346893769 + ... + 346893994.

It is an arithmetic number, because the mean of its divisors is an integer number (19772951274).

Almost surely, 2^78398017219 is an apocalyptic number.

78398017219 is a deficient number, since it is larger than the sum of its proper divisors (693787877).

78398017219 is a wasteful number, since it uses less digits than its factorization.

78398017219 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 693787876.

The product of its (nonzero) digits is 1524096, while the sum is 55.

The spelling of 78398017219 in words is "seventy-eight billion, three hundred ninety-eight million, seventeen thousand, two hundred nineteen".