128928554 has 8 divisors (see below), whose sum is σ = 193824900. Its totient is φ = 64320256.

The previous prime is 128928533. The next prime is 128928571. The reversal of 128928554 is 455829821.

It can be written as a sum of positive squares in 2 ways, for example, as 113912929 + 15015625 = 10673^2 + 3875^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70889 + ... + 72684.

Almost surely, 2^128928554 is an apocalyptic number.

128928554 is a deficient number, since it is larger than the sum of its proper divisors (64896346).

128928554 is a wasteful number, since it uses less digits than its factorization.

128928554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144024.

The product of its digits is 230400, while the sum is 44.

The square root of 128928554 is about 11354.6710212141. The cubic root of 128928554 is about 505.1841357073.

The spelling of 128928554 in words is "one hundred twenty-eight million, nine hundred twenty-eight thousand, five hundred fifty-four".