28544740 has 48 divisors (see below), whose sum is σ = 69818112. Its totient is φ = 9599616.

The previous prime is 28544693. The next prime is 28544743. The reversal of 28544740 is 4744582.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 28544696 and 28544705.

It is not an unprimeable number, because it can be changed into a prime (28544743) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5497 + ... + 9343.

It is an arithmetic number, because the mean of its divisors is an integer number (1454544).

Almost surely, 2^28544740 is an apocalyptic number.

28544740 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 28544740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34909056).

28544740 is an abundant number, since it is smaller than the sum of its proper divisors (41273372).

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

28544740 is a wasteful number, since it uses less digits than its factorization.

28544740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3916 (or 3914 counting only the distinct ones).

The product of its (nonzero) digits is 35840, while the sum is 34.

The square root of 28544740 is about 5342.7277677232. The cubic root of 28544740 is about 305.6154909547.

Adding to 28544740 its product of nonzero digits (35840), we get a triangular number (28580580 = T₇₅₆₀).

The spelling of 28544740 in words is "twenty-eight million, five hundred forty-four thousand, seven hundred forty".