28025478 has 48 divisors (see below), whose sum is σ = 65803920. Its totient is φ = 8569152.

The previous prime is 28025461. The next prime is 28025479. The reversal of 28025478 is 87452082.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28025479) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 53325 + ... + 53847.

It is an arithmetic number, because the mean of its divisors is an integer number (1370915).

Almost surely, 2^28025478 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28025478, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32901960).

28025478 is an abundant number, since it is smaller than the sum of its proper divisors (37778442).

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

28025478 is a wasteful number, since it uses less digits than its factorization.

28025478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 773 (or 770 counting only the distinct ones).

The product of its (nonzero) digits is 35840, while the sum is 36.

The square root of 28025478 is about 5293.9095194384. The cubic root of 28025478 is about 303.7509719016.

The spelling of 28025478 in words is "twenty-eight million, twenty-five thousand, four hundred seventy-eight".