28497923 has 4 divisors (see below), whose sum is σ = 29480640. Its totient is φ = 27515208.

The previous prime is 28497901. The next prime is 28497947. The reversal of 28497923 is 32979482.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32979482 = 2 ⋅16489741.

It is a cyclic number.

It is not a de Polignac number, because 28497923 - 2¹⁴ = 28481539 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28497323) 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, 491315 + ... + 491372.

It is an arithmetic number, because the mean of its divisors is an integer number (7370160).

Almost surely, 2^28497923 is an apocalyptic number.

28497923 is a deficient number, since it is larger than the sum of its proper divisors (982717).

28497923 is an equidigital number, since it uses as much as digits as its factorization.

28497923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 982716.

The product of its digits is 217728, while the sum is 44.

The square root of 28497923 is about 5338.3445935983. The cubic root of 28497923 is about 305.4483167820.

The spelling of 28497923 in words is "twenty-eight million, four hundred ninety-seven thousand, nine hundred twenty-three".