128928898 has 20 divisors (see below), whose sum is σ = 225620550. Its totient is φ = 55253184.

The previous prime is 128928881. The next prime is 128928941. The reversal of 128928898 is 898829821.

It can be written as a sum of positive squares in only one way, i.e., 119399329 + 9529569 = 10927^2 + 3087^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 8623 + ... + 18226.

Almost surely, 2^128928898 is an apocalyptic number.

128928898 is a deficient number, since it is larger than the sum of its proper divisors (96691652).

128928898 is an frugal number, since it uses more digits than its factorization.

128928898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26879 (or 26858 counting only the distinct ones).

The product of its digits is 1327104, while the sum is 55.

The square root of 128928898 is about 11354.6861691550. The cubic root of 128928898 is about 505.1845850083.

The spelling of 128928898 in words is "one hundred twenty-eight million, nine hundred twenty-eight thousand, eight hundred ninety-eight".