16128857 has 4 divisors (see below), whose sum is σ = 16356096. Its totient is φ = 15901620.

The previous prime is 16128841. The next prime is 16128863. The reversal of 16128857 is 75882161.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 16128857 - 2⁴ = 16128841 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16128857.

It is not an unprimeable number, because it can be changed into a prime (16128887) 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, 113513 + ... + 113654.

It is an arithmetic number, because the mean of its divisors is an integer number (4089024).

Almost surely, 2^16128857 is an apocalyptic number.

It is an amenable number.

16128857 is a deficient number, since it is larger than the sum of its proper divisors (227239).

16128857 is an equidigital number, since it uses as much as digits as its factorization.

16128857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227238.

The product of its digits is 26880, while the sum is 38.

The square root of 16128857 is about 4016.0748250002. The cubic root of 16128857 is about 252.6588589594.

The spelling of 16128857 in words is "sixteen million, one hundred twenty-eight thousand, eight hundred fifty-seven".