28029245 has 4 divisors (see below), whose sum is σ = 33635100. Its totient is φ = 22423392.

The previous prime is 28029233. The next prime is 28029251. The reversal of 28029245 is 54292082.

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 9821956 + 18207289 = 3134^2 + 4267^2 .

It is a cyclic number.

It is not a de Polignac number, because 28029245 - 2⁴ = 28029229 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2802920 + ... + 2802929.

It is an arithmetic number, because the mean of its divisors is an integer number (8408775).

Almost surely, 2^28029245 is an apocalyptic number.

It is an amenable number.

28029245 is a deficient number, since it is larger than the sum of its proper divisors (5605855).

28029245 is an equidigital number, since it uses as much as digits as its factorization.

28029245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5605854.

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 28029245 is about 5294.2652936928. The cubic root of 28029245 is about 303.7645806929.

The spelling of 28029245 in words is "twenty-eight million, twenty-nine thousand, two hundred forty-five".