13128845 has 16 divisors (see below), whose sum is σ = 16774128. Its totient is φ = 9830400.

The previous prime is 13128833. The next prime is 13128859. The reversal of 13128845 is 54882131.

It can be written as a sum of positive squares in 8 ways, for example, as 4116841 + 9012004 = 2029^2 + 3002^2 .

It is not a de Polignac number, because 13128845 - 2⁶ = 13128781 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21545 + ... + 22145.

It is an arithmetic number, because the mean of its divisors is an integer number (1048383).

Almost surely, 2^13128845 is an apocalyptic number.

It is an amenable number.

13128845 is a deficient number, since it is larger than the sum of its proper divisors (3645283).

13128845 is a wasteful number, since it uses less digits than its factorization.

13128845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 880.

The product of its digits is 7680, while the sum is 32.

The square root of 13128845 is about 3623.3748081036. The cubic root of 13128845 is about 235.9077310949.

The spelling of 13128845 in words is "thirteen million, one hundred twenty-eight thousand, eight hundred forty-five".