7999446978 has 32 divisors (see below), whose sum is σ = 17783253120. Its totient is φ = 2665476720.

The previous prime is 7999446947. The next prime is 7999446979. The reversal of 7999446978 is 8796449997.

7999446978 is a `hidden beast` number, since 7 + 9 + 9 + 94 + 469 + 78 = 666.

It is not an unprimeable number, because it can be changed into a prime (7999446979) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 124176 + ... + 177252.

It is an arithmetic number, because the mean of its divisors is an integer number (555726660).

Almost surely, 2^7999446978 is an apocalyptic number.

7999446978 is an abundant number, since it is smaller than the sum of its proper divisors (9783806142).

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

7999446978 is a wasteful number, since it uses less digits than its factorization.

7999446978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55879 (or 55873 counting only the distinct ones).

The product of its digits is 246903552, while the sum is 72.

The square root of 7999446978 is about 89439.6275596002. The cubic root of 7999446978 is about 1999.9539137714.

The spelling of 7999446978 in words is "seven billion, nine hundred ninety-nine million, four hundred forty-six thousand, nine hundred seventy-eight".