98128791 has 6 divisors (see below), whose sum is σ = 141741600. Its totient is φ = 65419188.

The previous prime is 98128781. The next prime is 98128801. The reversal of 98128791 is 19782189.

It is an interprime number because it is at equal distance from previous prime (98128781) and next prime (98128801).

It is not a de Polignac number, because 98128791 - 2¹⁰ = 98127767 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (98128781) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5451591 + ... + 5451608.

It is an arithmetic number, because the mean of its divisors is an integer number (23623600).

Almost surely, 2^98128791 is an apocalyptic number.

98128791 is a deficient number, since it is larger than the sum of its proper divisors (43612809).

98128791 is a wasteful number, since it uses less digits than its factorization.

98128791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10903205 (or 10903202 counting only the distinct ones).

The product of its digits is 72576, while the sum is 45.

The square root of 98128791 is about 9905.9977286490. The cubic root of 98128791 is about 461.2455077008.

Adding to 98128791 its sum of digits (45), we get a square (98128836 = 9906²).

The spelling of 98128791 in words is "ninety-eight million, one hundred twenty-eight thousand, seven hundred ninety-one".