7978964 has 18 divisors (see below), whose sum is σ = 16243290. Its totient is φ = 3419472.

The previous prime is 7978961. The next prime is 7978979. The reversal of 7978964 is 4698797.

It is a happy number.

7978964 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 6210064 + 1768900 = 2492^2 + 1330^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7978961) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 20159 + ... + 20550.

It is an arithmetic number, because the mean of its divisors is an integer number (902405).

Almost surely, 2^7978964 is an apocalyptic number.

It is an amenable number.

7978964 is an abundant number, since it is smaller than the sum of its proper divisors (8264326).

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

7978964 is a wasteful number, since it uses less digits than its factorization.

7978964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40727 (or 40718 counting only the distinct ones).

The product of its digits is 762048, while the sum is 50.

The square root of 7978964 is about 2824.7060024010. The cubic root of 7978964 is about 199.8245461247.

The spelling of 7978964 in words is "seven million, nine hundred seventy-eight thousand, nine hundred sixty-four".