16128845 has 4 divisors (see below), whose sum is σ = 19354620. Its totient is φ = 12903072.

The previous prime is 16128841. The next prime is 16128863. The reversal of 16128845 is 54882161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54882161 = 127 ⋅432143.

It can be written as a sum of positive squares in 2 ways, for example, as 11519236 + 4609609 = 3394^2 + 2147^2 .

It is a cyclic number.

It is not a de Polignac number, because 16128845 - 2² = 16128841 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16128841) 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, 1612880 + ... + 1612889.

It is an arithmetic number, because the mean of its divisors is an integer number (4838655).

Almost surely, 2^16128845 is an apocalyptic number.

It is an amenable number.

16128845 is a deficient number, since it is larger than the sum of its proper divisors (3225775).

16128845 is an equidigital number, since it uses as much as digits as its factorization.

16128845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3225774.

The product of its digits is 15360, while the sum is 35.

The square root of 16128845 is about 4016.0733310038. The cubic root of 16128845 is about 252.6587962993.

The spelling of 16128845 in words is "sixteen million, one hundred twenty-eight thousand, eight hundred forty-five".