28045601 has 4 divisors (see below), whose sum is σ = 28111104. Its totient is φ = 27980100.

The previous prime is 28045573. The next prime is 28045609. The reversal of 28045601 is 10654082.

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: 10654082 = 2 ⋅5327041.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28045601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28045609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32105 + ... + 32966.

It is an arithmetic number, because the mean of its divisors is an integer number (7027776).

Almost surely, 2^28045601 is an apocalyptic number.

It is an amenable number.

28045601 is a deficient number, since it is larger than the sum of its proper divisors (65503).

28045601 is an equidigital number, since it uses as much as digits as its factorization.

28045601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65502.

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 28045601 is about 5295.8097586677. The cubic root of 28045601 is about 303.8236547944.

Adding to 28045601 its reverse (10654082), we get a palindrome (38699683).

The spelling of 28045601 in words is "twenty-eight million, forty-five thousand, six hundred one".