28212747 has 8 divisors (see below), whose sum is σ = 37649040. Its totient is φ = 18792480.

The previous prime is 28212731. The next prime is 28212749. The reversal of 28212747 is 74721282.

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

It is not a de Polignac number, because 28212747 - 2⁴ = 28212731 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28212749) 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, 997 + ... + 7577.

It is an arithmetic number, because the mean of its divisors is an integer number (4706130).

Almost surely, 2^28212747 is an apocalyptic number.

28212747 is a deficient number, since it is larger than the sum of its proper divisors (9436293).

28212747 is a wasteful number, since it uses less digits than its factorization.

28212747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8013.

The product of its digits is 12544, while the sum is 33.

The square root of 28212747 is about 5311.5672828272. The cubic root of 28212747 is about 304.4260351355.

The spelling of 28212747 in words is "twenty-eight million, two hundred twelve thousand, seven hundred forty-seven".