28288685 has 8 divisors (see below), whose sum is σ = 34027776. Its totient is φ = 22576720.

The previous prime is 28288681. The next prime is 28288691. The reversal of 28288685 is 58688282.

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

It is not a de Polignac number, because 28288685 - 2² = 28288681 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 (28288681) 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, 4409 + ... + 8718.

It is an arithmetic number, because the mean of its divisors is an integer number (4253472).

Almost surely, 2^28288685 is an apocalyptic number.

It is an amenable number.

28288685 is a deficient number, since it is larger than the sum of its proper divisors (5739091).

28288685 is a wasteful number, since it uses less digits than its factorization.

28288685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13563.

The product of its digits is 491520, while the sum is 47.

The square root of 28288685 is about 5318.7108400439. The cubic root of 28288685 is about 304.6989235340.

The spelling of 28288685 in words is "twenty-eight million, two hundred eighty-eight thousand, six hundred eighty-five".