28444680 has 144 divisors (see below), whose sum is σ = 101768940. Its totient is φ = 6885120.

The previous prime is 28444657. The next prime is 28444697. The reversal of 28444680 is 8644482.

It can be written as a sum of positive squares in 2 ways, for example, as 27185796 + 1258884 = 5214^2 + 1122^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 43234 + ... + 43886.

Almost surely, 2^28444680 is an apocalyptic number.

28444680 is a gapful number since it is divisible by the number (20) 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 28444680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (50884470).

28444680 is an abundant number, since it is smaller than the sum of its proper divisors (73324260).

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

28444680 is a wasteful number, since it uses less digits than its factorization.

28444680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 692 (or 674 counting only the distinct ones).

The product of its (nonzero) digits is 49152, while the sum is 36.

The square root of 28444680 is about 5333.3554166209. The cubic root of 28444680 is about 305.2579739821.

The spelling of 28444680 in words is "twenty-eight million, four hundred forty-four thousand, six hundred eighty".