7990442784 has 72 divisors (see below), whose sum is σ = 22978207980. Its totient is φ = 2633545728.

The previous prime is 7990442783. The next prime is 7990442813. The reversal of 7990442784 is 4872440997.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 7844999184 + 145443600 = 88572^2 + 12060^2 .

It is a tau number, because it is divible by the number of its divisors (72).

It is a self number, because there is not a number n which added to its sum of digits gives 7990442784.

It is not an unprimeable number, because it can be changed into a prime (7990442783) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 130237 + ... + 181500.

Almost surely, 2^7990442784 is an apocalyptic number.

It is an amenable number.

7990442784 is an abundant number, since it is smaller than the sum of its proper divisors (14987765196).

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

7990442784 is a wasteful number, since it uses less digits than its factorization.

7990442784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 311842 (or 311831 counting only the distinct ones).

The product of its (nonzero) digits is 4064256, while the sum is 54.

The square root of 7990442784 is about 89389.2766723168. The cubic root of 7990442784 is about 1999.2032479686.

The spelling of 7990442784 in words is "seven billion, nine hundred ninety million, four hundred forty-two thousand, seven hundred eighty-four".