54128689 has 4 divisors (see below), whose sum is σ = 54155124. Its totient is φ = 54102256.

The previous prime is 54128687. The next prime is 54128693. The reversal of 54128689 is 98682145.

It is a happy number.

54128689 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 28037025 + 26091664 = 5295^2 + 5108^2 .

It is a cyclic number.

It is not a de Polignac number, because 54128689 - 2¹ = 54128687 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (54128681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9862 + ... + 14335.

It is an arithmetic number, because the mean of its divisors is an integer number (13538781).

Almost surely, 2^54128689 is an apocalyptic number.

It is an amenable number.

54128689 is a deficient number, since it is larger than the sum of its proper divisors (26435).

54128689 is a wasteful number, since it uses less digits than its factorization.

54128689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26434.

The product of its digits is 138240, while the sum is 43.

The square root of 54128689 is about 7357.2201951552. The cubic root of 54128689 is about 378.2763322863.

The spelling of 54128689 in words is "fifty-four million, one hundred twenty-eight thousand, six hundred eighty-nine".