28024897 has 4 divisors (see below), whose sum is σ = 28062676. Its totient is φ = 27987120.

The previous prime is 28024889. The next prime is 28024937. The reversal of 28024897 is 79842082.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 79842082 = 2 ⋅39921041.

It can be written as a sum of positive squares in 2 ways, for example, as 9024016 + 19000881 = 3004^2 + 4359^2 .

It is a cyclic number.

It is not a de Polignac number, because 28024897 - 2³ = 28024889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28021897) 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, 17754 + ... + 19267.

It is an arithmetic number, because the mean of its divisors is an integer number (7015669).

Almost surely, 2^28024897 is an apocalyptic number.

It is an amenable number.

28024897 is a deficient number, since it is larger than the sum of its proper divisors (37779).

28024897 is an equidigital number, since it uses as much as digits as its factorization.

28024897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37778.

The product of its (nonzero) digits is 64512, while the sum is 40.

The square root of 28024897 is about 5293.8546447744. The cubic root of 28024897 is about 303.7488728528.

The spelling of 28024897 in words is "twenty-eight million, twenty-four thousand, eight hundred ninety-seven".