7878484447 has 4 divisors (see below), whose sum is σ = 7881061336. Its totient is φ = 7875907560.

The previous prime is 7878484441. The next prime is 7878484451. The reversal of 7878484447 is 7444848787.

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 7878484447 - 2¹⁹ = 7877960159 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7878484441) 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, 1283853 + ... + 1289974.

It is an arithmetic number, because the mean of its divisors is an integer number (1970265334).

Almost surely, 2^7878484447 is an apocalyptic number.

7878484447 is a deficient number, since it is larger than the sum of its proper divisors (2576889).

7878484447 is a wasteful number, since it uses less digits than its factorization.

7878484447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2576888.

The product of its digits is 44957696, while the sum is 61.

The square root of 7878484447 is about 88760.8272099804. The cubic root of 7878484447 is about 1989.8219958960.

The spelling of 7878484447 in words is "seven billion, eight hundred seventy-eight million, four hundred eighty-four thousand, four hundred forty-seven".