28553250 has 64 divisors (see below), whose sum is σ = 77770368. Its totient is φ = 6920000.

The previous prime is 28553249. The next prime is 28553309. The reversal of 28553250 is 5235582.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6520 + ... + 9980.

It is an arithmetic number, because the mean of its divisors is an integer number (1215162).

Almost surely, 2^28553250 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28553250, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38885184).

28553250 is an abundant number, since it is smaller than the sum of its proper divisors (49217118).

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

28553250 is a wasteful number, since it uses less digits than its factorization.

28553250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3492 (or 3482 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 30.

The square root of 28553250 is about 5343.5241180330. The cubic root of 28553250 is about 305.6458588312.

It can be divided in two parts, 285532 and 50, that added together give a palindrome (285582).

The spelling of 28553250 in words is "twenty-eight million, five hundred fifty-three thousand, two hundred fifty".