7887878 has 4 divisors (see below), whose sum is σ = 11831820. Its totient is φ = 3943938.

The previous prime is 7887871. The next prime is 7887883. The reversal of 7887878 is 8787887.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7887871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1971968 + ... + 1971971.

It is an arithmetic number, because the mean of its divisors is an integer number (2957955).

Almost surely, 2^7887878 is an apocalyptic number.

7887878 is a deficient number, since it is larger than the sum of its proper divisors (3943942).

7887878 is a wasteful number, since it uses less digits than its factorization.

7887878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3943941.

The product of its digits is 1404928, while the sum is 53.

The square root of 7887878 is about 2808.5366296347. The cubic root of 7887878 is about 199.0612506422.

Subtracting 7887878 from its reverse (8787887), we obtain a palindrome (900009).

The spelling of 7887878 in words is "seven million, eight hundred eighty-seven thousand, eight hundred seventy-eight".