28252649 has 4 divisors (see below), whose sum is σ = 28941780. Its totient is φ = 27563520.

The previous prime is 28252613. The next prime is 28252661. The reversal of 28252649 is 94625282.

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 14115049 + 14137600 = 3757^2 + 3760^2 .

It is a cyclic number.

It is not a de Polignac number, because 28252649 - 2¹⁶ = 28187113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28252669) 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, 344504 + ... + 344585.

It is an arithmetic number, because the mean of its divisors is an integer number (7235445).

Almost surely, 2^28252649 is an apocalyptic number.

It is an amenable number.

28252649 is a deficient number, since it is larger than the sum of its proper divisors (689131).

28252649 is an equidigital number, since it uses as much as digits as its factorization.

28252649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 689130.

The product of its digits is 69120, while the sum is 38.

The square root of 28252649 is about 5315.3220974838. The cubic root of 28252649 is about 304.5694866689.

The spelling of 28252649 in words is "twenty-eight million, two hundred fifty-two thousand, six hundred forty-nine".