28512001 has 4 divisors (see below), whose sum is σ = 32585152. Its totient is φ = 24438852.

The previous prime is 28511993. The next prime is 28512013. The reversal of 28512001 is 10021582.

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, and also an emirpimes, since its reverse is a distinct semiprime: 10021582 = 2 ⋅5010791.

It is a cyclic number.

It is not a de Polignac number, because 28512001 - 2³ = 28511993 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 28512001.

It is not an unprimeable number, because it can be changed into a prime (28512031) 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 3 ways as a sum of consecutive naturals, for example, 2036565 + ... + 2036578.

It is an arithmetic number, because the mean of its divisors is an integer number (8146288).

Almost surely, 2^28512001 is an apocalyptic number.

It is an amenable number.

28512001 is a deficient number, since it is larger than the sum of its proper divisors (4073151).

28512001 is an equidigital number, since it uses as much as digits as its factorization.

28512001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4073150.

The product of its (nonzero) digits is 160, while the sum is 19.

The square root of 28512001 is about 5339.6630043477. The cubic root of 28512001 is about 305.4986057511.

Adding to 28512001 its reverse (10021582), we get a palindrome (38533583).

The spelling of 28512001 in words is "twenty-eight million, five hundred twelve thousand, one".