7878447 has 24 divisors (see below), whose sum is σ = 11915280. Its totient is φ = 5011200.

The previous prime is 7878439. The next prime is 7878461. The reversal of 7878447 is 7448787.

It is not a de Polignac number, because 7878447 - 2³ = 7878439 is a prime.

It is a d-powerful number, because it can be written as 7² + 8 + 7² + 8⁷ + 4 + 4⁷ + 7⁸ .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7878427) 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, 19447 + ... + 19847.

It is an arithmetic number, because the mean of its divisors is an integer number (496470).

Almost surely, 2^7878447 is an apocalyptic number.

7878447 is a deficient number, since it is larger than the sum of its proper divisors (4036833).

7878447 is a wasteful number, since it uses less digits than its factorization.

7878447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 503 (or 500 counting only the distinct ones).

The product of its digits is 351232, while the sum is 45.

The square root of 7878447 is about 2806.8571392217. The cubic root of 7878447 is about 198.9818843302.

The spelling of 7878447 in words is "seven million, eight hundred seventy-eight thousand, four hundred forty-seven".