7878345 has 16 divisors (see below), whose sum is σ = 12640320. Its totient is φ = 4190144.

The previous prime is 7878341. The next prime is 7878347. The reversal of 7878345 is 5438787.

7878345 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 7878345 - 2² = 7878341 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 7878297 and 7878306.

It is not an unprimeable number, because it can be changed into a prime (7878341) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9487 + ... + 10283.

It is an arithmetic number, because the mean of its divisors is an integer number (790020).

Almost surely, 2^7878345 is an apocalyptic number.

It is an amenable number.

7878345 is a deficient number, since it is larger than the sum of its proper divisors (4761975).

7878345 is a wasteful number, since it uses less digits than its factorization.

7878345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1464.

The product of its digits is 188160, while the sum is 42.

The square root of 7878345 is about 2806.8389693746. The cubic root of 7878345 is about 198.9810256060.

The spelling of 7878345 in words is "seven million, eight hundred seventy-eight thousand, three hundred forty-five".