28445428 has 24 divisors (see below), whose sum is σ = 54966240. Its totient is φ = 12772320.

The previous prime is 28445401. The next prime is 28445429. The reversal of 28445428 is 82454482.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28445429) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 243 + ... + 7546.

It is an arithmetic number, because the mean of its divisors is an integer number (2290260).

Almost surely, 2^28445428 is an apocalyptic number.

It is an amenable number.

28445428 is a deficient number, since it is larger than the sum of its proper divisors (26520812).

28445428 is a wasteful number, since it uses less digits than its factorization.

28445428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7887 (or 7885 counting only the distinct ones).

The product of its digits is 81920, while the sum is 37.

The square root of 28445428 is about 5333.4255408696. The cubic root of 28445428 is about 305.2606497134.

It can be divided in two parts, 284454 and 28, that added together give a palindrome (284482).

The spelling of 28445428 in words is "twenty-eight million, four hundred forty-five thousand, four hundred twenty-eight".