7978716 has 24 divisors (see below), whose sum is σ = 20685840. Its totient is φ = 2659536.

The previous prime is 7978709. The next prime is 7978721. The reversal of 7978716 is 6178797.

It is a happy number.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36831 + ... + 37046.

It is an arithmetic number, because the mean of its divisors is an integer number (861910).

Almost surely, 2^7978716 is an apocalyptic number.

It is an amenable number.

7978716 is an abundant number, since it is smaller than the sum of its proper divisors (12707124).

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

7978716 is a wasteful number, since it uses less digits than its factorization.

7978716 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73890 (or 73882 counting only the distinct ones).

The product of its digits is 148176, while the sum is 45.

The square root of 7978716 is about 2824.6621036860. The cubic root of 7978716 is about 199.8224758058.

The spelling of 7978716 in words is "seven million, nine hundred seventy-eight thousand, seven hundred sixteen".