28245438 has 48 divisors (see below), whose sum is σ = 69385680. Its totient is φ = 8232192.

The previous prime is 28245431. The next prime is 28245461. The reversal of 28245438 is 83454282.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28245431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1270 + ... + 7622.

It is an arithmetic number, because the mean of its divisors is an integer number (1445535).

Almost surely, 2^28245438 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28245438, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34692840).

28245438 is an abundant number, since it is smaller than the sum of its proper divisors (41140242).

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

28245438 is a wasteful number, since it uses less digits than its factorization.

28245438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6393 (or 6390 counting only the distinct ones).

The product of its digits is 61440, while the sum is 36.

The square root of 28245438 is about 5314.6437321800. The cubic root of 28245438 is about 304.5435724328.

The spelling of 28245438 in words is "twenty-eight million, two hundred forty-five thousand, four hundred thirty-eight".