28140715 has 8 divisors (see below), whose sum is σ = 34858368. Its totient is φ = 21786240.

The previous prime is 28140713. The next prime is 28140731. The reversal of 28140715 is 51704182.

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

It is not a de Polignac number, because 28140715 - 2¹ = 28140713 is a prime.

It is a super-2 number, since 2×28140715² = 1583799681422450, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28140713) 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, 90622 + ... + 90931.

It is an arithmetic number, because the mean of its divisors is an integer number (4357296).

Almost surely, 2^28140715 is an apocalyptic number.

28140715 is a deficient number, since it is larger than the sum of its proper divisors (6717653).

28140715 is a wasteful number, since it uses less digits than its factorization.

28140715 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181589.

The product of its (nonzero) digits is 2240, while the sum is 28.

The square root of 28140715 is about 5304.7822763993. The cubic root of 28140715 is about 304.1667303017.

Adding to 28140715 its reverse (51704182), we get a palindrome (79844897).

The spelling of 28140715 in words is "twenty-eight million, one hundred forty thousand, seven hundred fifteen".