7994522978 has 16 divisors (see below), whose sum is σ = 13330818816. Its totient is φ = 3570754320.

The previous prime is 7994522971. The next prime is 7994523023. The reversal of 7994522978 is 8792254997.

It is a Harshad number since it is a multiple of its sum of digits (62).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 7994522978.

It is not an unprimeable number, because it can be changed into a prime (7994522971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4958576 + ... + 4960187.

It is an arithmetic number, because the mean of its divisors is an integer number (833176176).

Almost surely, 2^7994522978 is an apocalyptic number.

7994522978 is a deficient number, since it is larger than the sum of its proper divisors (5336295838).

7994522978 is a wasteful number, since it uses less digits than its factorization.

7994522978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9918809.

The product of its digits is 22861440, while the sum is 62.

The square root of 7994522978 is about 89412.0963740366. The cubic root of 7994522978 is about 1999.5434773014.

The spelling of 7994522978 in words is "seven billion, nine hundred ninety-four million, five hundred twenty-two thousand, nine hundred seventy-eight".