28288615 has 8 divisors (see below), whose sum is σ = 34214400. Its totient is φ = 22452192.

The previous prime is 28288607. The next prime is 28288619. The reversal of 28288615 is 51688282.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 28288615 - 2³ = 28288607 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28288619) 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, 21640 + ... + 22909.

It is an arithmetic number, because the mean of its divisors is an integer number (4276800).

Almost surely, 2^28288615 is an apocalyptic number.

28288615 is a deficient number, since it is larger than the sum of its proper divisors (5925785).

28288615 is a wasteful number, since it uses less digits than its factorization.

28288615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44681.

The product of its digits is 61440, while the sum is 40.

The square root of 28288615 is about 5318.7042594978. The cubic root of 28288615 is about 304.6986722092.

The spelling of 28288615 in words is "twenty-eight million, two hundred eighty-eight thousand, six hundred fifteen".