7878636 has 36 divisors (see below), whose sum is σ = 20147400. Its totient is φ = 2595648.

The previous prime is 7878613. The next prime is 7878641. The reversal of 7878636 is 6368787.

7878636 is a `hidden beast` number, since 7 + 8 + 7 + 8 + 636 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 7878591 and 7878600.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1975 + ... + 4433.

It is an arithmetic number, because the mean of its divisors is an integer number (559650).

Almost surely, 2^7878636 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7878636, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10073700).

7878636 is an abundant number, since it is smaller than the sum of its proper divisors (12268764).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

7878636 is a wasteful number, since it uses less digits than its factorization.

7878636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2558 (or 2553 counting only the distinct ones).

The product of its digits is 338688, while the sum is 45.

The square root of 7878636 is about 2806.8908065687. The cubic root of 7878636 is about 198.9834754761.

The spelling of 7878636 in words is "seven million, eight hundred seventy-eight thousand, six hundred thirty-six".