28240615 has 8 divisors (see below), whose sum is σ = 36495648. Its totient is φ = 20854560.

The previous prime is 28240613. The next prime is 28240627. The reversal of 28240615 is 51604282.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28240615 - 2¹ = 28240613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28240613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 217171 + ... + 217300.

It is an arithmetic number, because the mean of its divisors is an integer number (4561956).

Almost surely, 2^28240615 is an apocalyptic number.

28240615 is a deficient number, since it is larger than the sum of its proper divisors (8255033).

28240615 is a wasteful number, since it uses less digits than its factorization.

28240615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 434489.

The product of its (nonzero) digits is 3840, while the sum is 28.

The square root of 28240615 is about 5314.1899664954. The cubic root of 28240615 is about 304.5262375124.

Adding to 28240615 its reverse (51604282), we get a palindrome (79844897).

The spelling of 28240615 in words is "twenty-eight million, two hundred forty thousand, six hundred fifteen".