7686978 has 32 divisors (see below), whose sum is σ = 16699200. Its totient is φ = 2344896.

The previous prime is 7686953. The next prime is 7686979. The reversal of 7686978 is 8796867.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 7686978.

It is not an unprimeable number, because it can be changed into a prime (7686979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10488 + ... + 11196.

It is an arithmetic number, because the mean of its divisors is an integer number (521850).

Almost surely, 2^7686978 is an apocalyptic number.

7686978 is a gapful number since it is divisible by the number (78) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 7686978, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8349600).

7686978 is an abundant number, since it is smaller than the sum of its proper divisors (9012222).

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

7686978 is a wasteful number, since it uses less digits than its factorization.

7686978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 866.

The product of its digits is 1016064, while the sum is 51.

The square root of 7686978 is about 2772.5399906945. The cubic root of 7686978 is about 197.3567021215.

The spelling of 7686978 in words is "seven million, six hundred eighty-six thousand, nine hundred seventy-eight".