28023601 has 4 divisors (see below), whose sum is σ = 28044900. Its totient is φ = 28002304.

The previous prime is 28023587. The next prime is 28023617. The reversal of 28023601 is 10632082.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10632082 = 2 ⋅5316041.

It can be written as a sum of positive squares in 2 ways, for example, as 12215025 + 15808576 = 3495^2 + 3976^2 .

It is a cyclic number.

It is not a de Polignac number, because 28023601 - 2¹⁹ = 27499313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28023691) 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, 8536 + ... + 11353.

It is an arithmetic number, because the mean of its divisors is an integer number (7011225).

Almost surely, 2^28023601 is an apocalyptic number.

It is an amenable number.

28023601 is a deficient number, since it is larger than the sum of its proper divisors (21299).

28023601 is a wasteful number, since it uses less digits than its factorization.

28023601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21298.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 28023601 is about 5293.7322372783. The cubic root of 28023601 is about 303.7441905328.

Adding to 28023601 its reverse (10632082), we get a palindrome (38655683).

The spelling of 28023601 in words is "twenty-eight million, twenty-three thousand, six hundred one".