998128807 has 8 divisors (see below), whose sum is σ = 1095189984. Its totient is φ = 903965088.

The previous prime is 998128753. The next prime is 998128823. The reversal of 998128807 is 708821899.

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

It is a de Polignac number, because none of the positive numbers 2^k-998128807 is a prime.

It is a super-2 number, since 2×998128807² = 1992522230726486498, 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 (998128847) 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, 723643 + ... + 725020.

It is an arithmetic number, because the mean of its divisors is an integer number (136898748).

Almost surely, 2^998128807 is an apocalyptic number.

998128807 is a deficient number, since it is larger than the sum of its proper divisors (97061177).

998128807 is a wasteful number, since it uses less digits than its factorization.

998128807 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1448729.

The product of its (nonzero) digits is 580608, while the sum is 52.

The square root of 998128807 is about 31593.1765892574. The cubic root of 998128807 is about 999.3758795547.

The spelling of 998128807 in words is "nine hundred ninety-eight million, one hundred twenty-eight thousand, eight hundred seven".