9999998280 has 96 divisors (see below), whose sum is σ = 32787738360. Its totient is φ = 2643056640.

The previous prime is 9999998273. The next prime is 9999998311. The reversal of 9999998280 is 828999999.

It can be written as a sum of positive squares in 4 ways, for example, as 2811332484 + 7188665796 = 53022^2 + 84786^2 .

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a junction number, because it is equal to n+sod(n) for n = 9999998199 and 9999998208.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 82231 + ... + 163590.

Almost surely, 2^9999998280 is an apocalyptic number.

9999998280 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

9999998280 is an abundant number, since it is smaller than the sum of its proper divisors (22787740080).

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

9999998280 is a wasteful number, since it uses less digits than its factorization.

9999998280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245951 (or 245944 counting only the distinct ones).

The product of its (nonzero) digits is 68024448, while the sum is 72.

The square root of 9999998280 is about 99999.9913999996. The cubic root of 9999998280 is about 2154.4345665110.

The spelling of 9999998280 in words is "nine billion, nine hundred ninety-nine million, nine hundred ninety-eight thousand, two hundred eighty".