998128799 has 8 divisors (see below), whose sum is σ = 1007620800. Its totient is φ = 988674336.

The previous prime is 998128753. The next prime is 998128823. The reversal of 998128799 is 997821899.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 998128799 - 2¹⁶ = 998063263 is a prime.

It is a super-2 number, since 2×998128799² = 1992522198786364802, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (998128709) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45557 + ... + 63809.

It is an arithmetic number, because the mean of its divisors is an integer number (125952600).

Almost surely, 2^998128799 is an apocalyptic number.

998128799 is a deficient number, since it is larger than the sum of its proper divisors (9492001).

998128799 is a wasteful number, since it uses less digits than its factorization.

998128799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18769.

The product of its digits is 5878656, while the sum is 62.

The square root of 998128799 is about 31593.1764626478. The cubic root of 998128799 is about 999.3758768847.

The spelling of 998128799 in words is "nine hundred ninety-eight million, one hundred twenty-eight thousand, seven hundred ninety-nine".