28240704 has 112 divisors (see below), whose sum is σ = 84734400. Its totient is φ = 9220608.

The previous prime is 28240703. The next prime is 28240717. The reversal of 28240704 is 40704282.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28240703) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 101814 + ... + 102090.

Almost surely, 2^28240704 is an apocalyptic number.

28240704 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 28240704, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42367200).

28240704 is an abundant number, since it is smaller than the sum of its proper divisors (56493696).

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

28240704 is a wasteful number, since it uses less digits than its factorization.

28240704 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 357 (or 341 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 27.

The square root of 28240704 is about 5314.1983402956. The cubic root of 28240704 is about 304.5265574158.

Adding to 28240704 its reverse (40704282), we get a palindrome (68944986).

The spelling of 28240704 in words is "twenty-eight million, two hundred forty thousand, seven hundred four".