28430653 has 4 divisors (see below), whose sum is σ = 28820188. Its totient is φ = 28041120.

The previous prime is 28430639. The next prime is 28430657. The reversal of 28430653 is 35603482.

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 21178404 + 7252249 = 4602^2 + 2693^2 .

It is a cyclic number.

It is not a de Polignac number, because 28430653 - 2⁵ = 28430621 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 (28430657) 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, 194658 + ... + 194803.

It is an arithmetic number, because the mean of its divisors is an integer number (7205047).

Almost surely, 2^28430653 is an apocalyptic number.

It is an amenable number.

28430653 is a deficient number, since it is larger than the sum of its proper divisors (389535).

28430653 is an equidigital number, since it uses as much as digits as its factorization.

28430653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 389534.

The product of its (nonzero) digits is 17280, while the sum is 31.

The square root of 28430653 is about 5332.0402286554. The cubic root of 28430653 is about 305.2077881754.

The spelling of 28430653 in words is "twenty-eight million, four hundred thirty thousand, six hundred fifty-three".