28904653 has 4 divisors (see below), whose sum is σ = 28916028. Its totient is φ = 28893280.

The previous prime is 28904647. The next prime is 28904717. The reversal of 28904653 is 35640982.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 4678569 + 24226084 = 2163^2 + 4922^2 .

It is a cyclic number.

It is not a de Polignac number, because 28904653 - 2⁵ = 28904621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28904053) 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, 63 + ... + 7603.

It is an arithmetic number, because the mean of its divisors is an integer number (7229007).

Almost surely, 2^28904653 is an apocalyptic number.

It is an amenable number.

28904653 is a deficient number, since it is larger than the sum of its proper divisors (11375).

28904653 is an equidigital number, since it uses as much as digits as its factorization.

28904653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11374.

The product of its (nonzero) digits is 51840, while the sum is 37.

The square root of 28904653 is about 5376.3047718670. The cubic root of 28904653 is about 306.8946046131.

The spelling of 28904653 in words is "twenty-eight million, nine hundred four thousand, six hundred fifty-three".