8888799978 has 32 divisors (see below), whose sum is σ = 19776988800. Its totient is φ = 2959318368.

The previous prime is 8888799967. The next prime is 8888799991. The reversal of 8888799978 is 8799978888.

It is a junction number, because it is equal to n+sod(n) for n = 8888799897 and 8888799906.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 55563 + ... + 144446.

It is an arithmetic number, because the mean of its divisors is an integer number (618030900).

Almost surely, 2^8888799978 is an apocalyptic number.

8888799978 is an abundant number, since it is smaller than the sum of its proper divisors (10888188822).

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

8888799978 is a wasteful number, since it uses less digits than its factorization.

8888799978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200843 (or 200837 counting only the distinct ones).

The product of its digits is 1170505728, while the sum is 81.

The square root of 8888799978 is about 94280.4326358338. The cubic root of 8888799978 is about 2071.4814306094.

The spelling of 8888799978 in words is "eight billion, eight hundred eighty-eight million, seven hundred ninety-nine thousand, nine hundred seventy-eight".