28309153 has 4 divisors (see below), whose sum is σ = 28568980. Its totient is φ = 28049328.

The previous prime is 28309139. The next prime is 28309217. The reversal of 28309153 is 35190382.

It is a happy number.

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 18215824 + 10093329 = 4268^2 + 3177^2 .

It is a cyclic number.

It is not a de Polignac number, because 28309153 - 2⁵ = 28309121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28309103) 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, 129750 + ... + 129967.

It is an arithmetic number, because the mean of its divisors is an integer number (7142245).

Almost surely, 2^28309153 is an apocalyptic number.

It is an amenable number.

28309153 is a deficient number, since it is larger than the sum of its proper divisors (259827).

28309153 is a wasteful number, since it uses less digits than its factorization.

28309153 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 259826.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 28309153 is about 5320.6346425967. The cubic root of 28309153 is about 304.7723931213.

The spelling of 28309153 in words is "twenty-eight million, three hundred nine thousand, one hundred fifty-three".