7878385919 has 4 divisors (see below), whose sum is σ = 7923925896. Its totient is φ = 7832845944.

The previous prime is 7878385901. The next prime is 7878385961. The reversal of 7878385919 is 9195838787.

It is a happy number.

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 7878385919 - 2²⁰ = 7877337343 is a prime.

It is a super-2 number, since 2×7878385919² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7878385969) 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, 22769729 + ... + 22770074.

It is an arithmetic number, because the mean of its divisors is an integer number (1980981474).

Almost surely, 2^7878385919 is an apocalyptic number.

7878385919 is a deficient number, since it is larger than the sum of its proper divisors (45539977).

7878385919 is a wasteful number, since it uses less digits than its factorization.

7878385919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45539976.

The product of its digits is 30481920, while the sum is 65.

The square root of 7878385919 is about 88760.2721886318. The cubic root of 7878385919 is about 1989.8137009843.

The spelling of 7878385919 in words is "seven billion, eight hundred seventy-eight million, three hundred eighty-five thousand, nine hundred nineteen".