28252789 has 4 divisors (see below), whose sum is σ = 28285740. Its totient is φ = 28219840.

The previous prime is 28252787. The next prime is 28252837. The reversal of 28252789 is 98725282.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 98725282 = 2 ⋅49362641.

It can be written as a sum of positive squares in 2 ways, for example, as 14190289 + 14062500 = 3767^2 + 3750^2 .

It is a cyclic number.

It is not a de Polignac number, because 28252789 - 2¹ = 28252787 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 (28252787) 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, 15154 + ... + 16915.

It is an arithmetic number, because the mean of its divisors is an integer number (7071435).

Almost surely, 2^28252789 is an apocalyptic number.

It is an amenable number.

28252789 is a deficient number, since it is larger than the sum of its proper divisors (32951).

28252789 is an equidigital number, since it uses as much as digits as its factorization.

28252789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32950.

The product of its digits is 161280, while the sum is 43.

The square root of 28252789 is about 5315.3352669422. The cubic root of 28252789 is about 304.5699897445.

The spelling of 28252789 in words is "twenty-eight million, two hundred fifty-two thousand, seven hundred eighty-nine".