28440048 has 160 divisors (see below), whose sum is σ = 95993856. Its totient is φ = 7041024.

The previous prime is 28440043. The next prime is 28440053. The reversal of 28440048 is 84004482.

It is an interprime number because it is at equal distance from previous prime (28440043) and next prime (28440053).

It is a junction number, because it is equal to n+sod(n) for n = 28439997 and 28440024.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28440043) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 74065 + ... + 74447.

Almost surely, 2^28440048 is an apocalyptic number.

28440048 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28440048, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47996928).

28440048 is an abundant number, since it is smaller than the sum of its proper divisors (67553808).

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

28440048 is a wasteful number, since it uses less digits than its factorization.

28440048 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 431 (or 425 counting only the distinct ones).

The product of its (nonzero) digits is 8192, while the sum is 30.

The square root of 28440048 is about 5332.9211507391. The cubic root of 28440048 is about 305.2414034354.

The spelling of 28440048 in words is "twenty-eight million, four hundred forty thousand, forty-eight".