28252578 has 8 divisors (see below), whose sum is σ = 56505168. Its totient is φ = 9417524.

The previous prime is 28252573. The next prime is 28252603. The reversal of 28252578 is 87525282.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

28252578 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (28252573) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2354376 + ... + 2354387.

It is an arithmetic number, because the mean of its divisors is an integer number (7063146).

Almost surely, 2^28252578 is an apocalyptic number.

28252578 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28252578 is a wasteful number, since it uses less digits than its factorization.

28252578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4708768.

The product of its digits is 89600, while the sum is 39.

The square root of 28252578 is about 5315.3154186746. The cubic root of 28252578 is about 304.5692315370.

The spelling of 28252578 in words is "twenty-eight million, two hundred fifty-two thousand, five hundred seventy-eight".