28231285 has 8 divisors (see below), whose sum is σ = 33914880. Its totient is φ = 22560144.

The previous prime is 28231277. The next prime is 28231289. The reversal of 28231285 is 58213282.

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 28231285 - 2³ = 28231277 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28231289) 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, 2956 + ... + 8074.

It is an arithmetic number, because the mean of its divisors is an integer number (4239360).

Almost surely, 2^28231285 is an apocalyptic number.

It is an amenable number.

28231285 is a deficient number, since it is larger than the sum of its proper divisors (5683595).

28231285 is a wasteful number, since it uses less digits than its factorization.

28231285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6227.

The product of its digits is 7680, while the sum is 31.

The square root of 28231285 is about 5313.3120555827. The cubic root of 28231285 is about 304.4926978421.

The spelling of 28231285 in words is "twenty-eight million, two hundred thirty-one thousand, two hundred eighty-five".