7878656 has 24 divisors (see below), whose sum is σ = 15757560. Its totient is φ = 3938304.

The previous prime is 7878653. The next prime is 7878677. The reversal of 7878656 is 6568787.

It is a zygodrome in base 2.

It is a self number, because there is not a number n which added to its sum of digits gives 7878656.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7878653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125 + ... + 3971.

It is an arithmetic number, because the mean of its divisors is an integer number (656565).

Almost surely, 2^7878656 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 7878656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7878780).

7878656 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

7878656 is an equidigital number, since it uses as much as digits as its factorization.

7878656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3869 (or 3849 counting only the distinct ones).

The product of its digits is 564480, while the sum is 47.

The square root of 7878656 is about 2806.8943692273. The cubic root of 7878656 is about 198.9836438498.

The spelling of 7878656 in words is "seven million, eight hundred seventy-eight thousand, six hundred fifty-six".