28017212 has 12 divisors (see below), whose sum is σ = 49861560. Its totient is φ = 13771056.

The previous prime is 28017203. The next prime is 28017221. The reversal of 28017212 is 21271082.

It is an interprime number because it is at equal distance from previous prime (28017203) and next prime (28017221).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 59123 + ... + 59594.

It is an arithmetic number, because the mean of its divisors is an integer number (4155130).

Almost surely, 2^28017212 is an apocalyptic number.

It is an amenable number.

28017212 is a deficient number, since it is larger than the sum of its proper divisors (21844348).

28017212 is a wasteful number, since it uses less digits than its factorization.

28017212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118780 (or 118778 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 23.

The square root of 28017212 is about 5293.1287533934. The cubic root of 28017212 is about 303.7211055965.

Adding to 28017212 its reverse (21271082), we get a palindrome (49288294).

The spelling of 28017212 in words is "twenty-eight million, seventeen thousand, two hundred twelve".