28140515 has 8 divisors (see below), whose sum is σ = 36366288. Its totient is φ = 20780640.

The previous prime is 28140493. The next prime is 28140517. The reversal of 28140515 is 51504182.

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

It is not a de Polignac number, because 28140515 - 2¹⁰ = 28139491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28140517) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 216401 + ... + 216530.

It is an arithmetic number, because the mean of its divisors is an integer number (4545786).

Almost surely, 2^28140515 is an apocalyptic number.

28140515 is a deficient number, since it is larger than the sum of its proper divisors (8225773).

28140515 is a wasteful number, since it uses less digits than its factorization.

28140515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 432949.

The product of its (nonzero) digits is 1600, while the sum is 26.

The square root of 28140515 is about 5304.7634254508. The cubic root of 28140515 is about 304.1660097148.

Adding to 28140515 its reverse (51504182), we get a palindrome (79644697).

The spelling of 28140515 in words is "twenty-eight million, one hundred forty thousand, five hundred fifteen".