28012213 has 8 divisors (see below), whose sum is σ = 29643200. Its totient is φ = 26396928.

The previous prime is 28012211. The next prime is 28012223. The reversal of 28012213 is 31221082.

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

It is not a de Polignac number, because 28012213 - 2¹ = 28012211 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28012211) 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, 153 + ... + 7486.

It is an arithmetic number, because the mean of its divisors is an integer number (3705400).

Almost surely, 2^28012213 is an apocalyptic number.

It is an amenable number.

28012213 is a deficient number, since it is larger than the sum of its proper divisors (1630987).

28012213 is a wasteful number, since it uses less digits than its factorization.

28012213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7851.

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 28012213 is about 5292.6565163441. The cubic root of 28012213 is about 303.7030406047.

Adding to 28012213 its reverse (31221082), we get a palindrome (59233295).

The spelling of 28012213 in words is "twenty-eight million, twelve thousand, two hundred thirteen".