7878285 has 24 divisors (see below), whose sum is σ = 14128920. Its totient is φ = 4056192.

The previous prime is 7878271. The next prime is 7878289. The reversal of 7878285 is 5828787.

It is a happy number.

7878285 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 227529 + 7650756 = 477^2 + 2766^2 .

It is not a de Polignac number, because 7878285 - 2⁹ = 7877773 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

7878285 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 7878285.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7878289) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1714 + ... + 4323.

It is an arithmetic number, because the mean of its divisors is an integer number (588705).

Almost surely, 2^7878285 is an apocalyptic number.

It is an amenable number.

7878285 is a deficient number, since it is larger than the sum of its proper divisors (6250635).

7878285 is a wasteful number, since it uses less digits than its factorization.

7878285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6077 (or 6074 counting only the distinct ones).

The product of its digits is 250880, while the sum is 45.

The square root of 7878285 is about 2806.8282811743. The cubic root of 7878285 is about 198.9805204706.

The spelling of 7878285 in words is "seven million, eight hundred seventy-eight thousand, two hundred eighty-five".