7978642443 has 6 divisors (see below), whose sum is σ = 11524705764. Its totient is φ = 5319094956.

The previous prime is 7978642421. The next prime is 7978642447. The reversal of 7978642443 is 3442468797.

7978642443 is a `hidden beast` number, since 79 + 78 + 64 + 2 + 443 = 666.

It is not a de Polignac number, because 7978642443 - 2⁵ = 7978642411 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 7978642443.

It is not an unprimeable number, because it can be changed into a prime (7978642447) 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, 443257905 + ... + 443257922.

It is an arithmetic number, because the mean of its divisors is an integer number (1920784294).

Almost surely, 2^7978642443 is an apocalyptic number.

7978642443 is a deficient number, since it is larger than the sum of its proper divisors (3546063321).

7978642443 is a wasteful number, since it uses less digits than its factorization.

7978642443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 886515833 (or 886515830 counting only the distinct ones).

The product of its digits is 8128512, while the sum is 54.

The square root of 7978642443 is about 89323.2469349385. The cubic root of 7978642443 is about 1998.2186173924.

The spelling of 7978642443 in words is "seven billion, nine hundred seventy-eight million, six hundred forty-two thousand, four hundred forty-three".