28008553 has 4 divisors (see below), whose sum is σ = 28051588. Its totient is φ = 27965520.

The previous prime is 28008551. The next prime is 28008559. The reversal of 28008553 is 35580082.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10810944 + 17197609 = 3288^2 + 4147^2 .

It is a cyclic number.

It is not a de Polignac number, because 28008553 - 2¹ = 28008551 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28008551) 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, 20526 + ... + 21847.

It is an arithmetic number, because the mean of its divisors is an integer number (7012897).

Almost surely, 2^28008553 is an apocalyptic number.

It is an amenable number.

28008553 is a deficient number, since it is larger than the sum of its proper divisors (43035).

28008553 is an equidigital number, since it uses as much as digits as its factorization.

28008553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43034.

The product of its (nonzero) digits is 9600, while the sum is 31.

The square root of 28008553 is about 5292.3107429553. The cubic root of 28008553 is about 303.6898130226.

It can be divided in two parts, 28008 and 553, that added together give a 4-th power (28561 = 13⁴).

The spelling of 28008553 in words is "twenty-eight million, eight thousand, five hundred fifty-three".