28249344 has 144 divisors (see below), whose sum is σ = 86175040. Its totient is φ = 9123840.

The previous prime is 28249327. The next prime is 28249363. The reversal of 28249344 is 44394282.

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 28249299 and 28249308.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 421599 + ... + 421665.

Almost surely, 2^28249344 is an apocalyptic number.

28249344 is a gapful number since it is divisible by the number (24) 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 28249344, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43087520).

28249344 is an abundant number, since it is smaller than the sum of its proper divisors (57925696).

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

28249344 is an equidigital number, since it uses as much as digits as its factorization.

28249344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153 (or 133 counting only the distinct ones).

The product of its digits is 55296, while the sum is 36.

The square root of 28249344 is about 5315.0111947201. The cubic root of 28249344 is about 304.5576100078.

The spelling of 28249344 in words is "twenty-eight million, two hundred forty-nine thousand, three hundred forty-four".