98128987 has 4 divisors (see below), whose sum is σ = 107049816. Its totient is φ = 89208160.

The previous prime is 98128957. The next prime is 98128999. The reversal of 98128987 is 78982189.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-98128987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (98128907) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4460398 + ... + 4460419.

It is an arithmetic number, because the mean of its divisors is an integer number (26762454).

Almost surely, 2^98128987 is an apocalyptic number.

98128987 is a deficient number, since it is larger than the sum of its proper divisors (8920829).

98128987 is a wasteful number, since it uses less digits than its factorization.

98128987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8920828.

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

The square root of 98128987 is about 9906.0076216405. The cubic root of 98128987 is about 461.2458147940.

The spelling of 98128987 in words is "ninety-eight million, one hundred twenty-eight thousand, nine hundred eighty-seven".