28047450 has 72 divisors (see below), whose sum is σ = 74004192. Its totient is φ = 7028480.

The previous prime is 28047431. The next prime is 28047451. The reversal of 28047450 is 5474082.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28047451) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 43027 + ... + 43673.

It is an arithmetic number, because the mean of its divisors is an integer number (1027836).

Almost surely, 2^28047450 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28047450, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37002096).

28047450 is an abundant number, since it is smaller than the sum of its proper divisors (45956742).

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

28047450 is a wasteful number, since it uses less digits than its factorization.

28047450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 696 (or 674 counting only the distinct ones).

The product of its (nonzero) digits is 8960, while the sum is 30.

The square root of 28047450 is about 5295.9843277714. The cubic root of 28047450 is about 303.8303315111.

The spelling of 28047450 in words is "twenty-eight million, forty-seven thousand, four hundred fifty".