28128001 has 8 divisors (see below), whose sum is σ = 31264704. Its totient is φ = 25087920.

The previous prime is 28127987. The next prime is 28128017. The reversal of 28128001 is 10082182.

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

It is not a de Polignac number, because 28128001 - 2¹⁵ = 28095233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28128101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23541 + ... + 24706.

It is an arithmetic number, because the mean of its divisors is an integer number (3908088).

Almost surely, 2^28128001 is an apocalyptic number.

It is an amenable number.

28128001 is a deficient number, since it is larger than the sum of its proper divisors (3136703).

28128001 is a wasteful number, since it uses less digits than its factorization.

28128001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48311.

The product of its (nonzero) digits is 256, while the sum is 22.

The square root of 28128001 is about 5303.5837883454. The cubic root of 28128001 is about 304.1209158018.

It can be divided in two parts, 281 and 28001, that added together give a palindrome (28282).

The spelling of 28128001 in words is "twenty-eight million, one hundred twenty-eight thousand, one".