7978544 has 20 divisors (see below), whose sum is σ = 17667024. Its totient is φ = 3419328.

The previous prime is 7978519. The next prime is 7978547. The reversal of 7978544 is 4458797.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 7978495 and 7978504.

It is not an unprimeable number, because it can be changed into a prime (7978547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35507 + ... + 35730.

Almost surely, 2^7978544 is an apocalyptic number.

It is an amenable number.

7978544 is an abundant number, since it is smaller than the sum of its proper divisors (9688480).

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

7978544 is a wasteful number, since it uses less digits than its factorization.

7978544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71252 (or 71246 counting only the distinct ones).

The product of its digits is 282240, while the sum is 44.

The square root of 7978544 is about 2824.6316574024. The cubic root of 7978544 is about 199.8210399142.

The spelling of 7978544 in words is "seven million, nine hundred seventy-eight thousand, five hundred forty-four".