28217847 has 16 divisors (see below), whose sum is σ = 44000000. Its totient is φ = 15748992.

The previous prime is 28217837. The next prime is 28217851. The reversal of 28217847 is 74871282.

It is not a de Polignac number, because 28217847 - 2¹¹ = 28215799 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 (28217837) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14722 + ... + 16527.

It is an arithmetic number, because the mean of its divisors is an integer number (2750000).

Almost surely, 2^28217847 is an apocalyptic number.

28217847 is a deficient number, since it is larger than the sum of its proper divisors (15782153).

28217847 is a wasteful number, since it uses less digits than its factorization.

28217847 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31302.

The product of its digits is 50176, while the sum is 39.

The square root of 28217847 is about 5312.0473454215. The cubic root of 28217847 is about 304.4443776627. Note that the first 3 decimals are identical.

The spelling of 28217847 in words is "twenty-eight million, two hundred seventeen thousand, eight hundred forty-seven".