28445274 has 96 divisors (see below), whose sum is σ = 74378304. Its totient is φ = 7741440.

The previous prime is 28445269. The next prime is 28445279. The reversal of 28445274 is 47254482.

It is an interprime number because it is at equal distance from previous prime (28445269) and next prime (28445279).

It is a super-2 number, since 2×28445274² = 1618267225870152, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28445279) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 110554 + ... + 110810.

It is an arithmetic number, because the mean of its divisors is an integer number (774774).

Almost surely, 2^28445274 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28445274, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37189152).

28445274 is an abundant number, since it is smaller than the sum of its proper divisors (45933030).

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

28445274 is a wasteful number, since it uses less digits than its factorization.

28445274 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 332 (or 329 counting only the distinct ones).

The product of its digits is 71680, while the sum is 36.

The square root of 28445274 is about 5333.4111035996. The cubic root of 28445274 is about 305.2600988314.

It can be divided in two parts, 2844 and 5274, that added together give a palindrome (8118).

The spelling of 28445274 in words is "twenty-eight million, four hundred forty-five thousand, two hundred seventy-four".