28249650 has 144 divisors (see below), whose sum is σ = 89369280. Its totient is φ = 6307200.

The previous prime is 28249643. The next prime is 28249657. The reversal of 28249650 is 5694282.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (28249643) and next prime (28249657).

It is not an unprimeable number, because it can be changed into a prime (28249657) 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 71 ways as a sum of consecutive naturals, for example, 64131 + ... + 64569.

It is an arithmetic number, because the mean of its divisors is an integer number (620620).

Almost surely, 2^28249650 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28249650, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44684640).

28249650 is an abundant number, since it is smaller than the sum of its proper divisors (61119630).

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

28249650 is a wasteful number, since it uses less digits than its factorization.

28249650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 481 (or 473 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The square root of 28249650 is about 5315.0399810349. The cubic root of 28249650 is about 304.5587096710.

The spelling of 28249650 in words is "twenty-eight million, two hundred forty-nine thousand, six hundred fifty".