28761213 has 16 divisors (see below), whose sum is σ = 42307776. Its totient is φ = 17266560.

The previous prime is 28761209. The next prime is 28761223. The reversal of 28761213 is 31216782.

It is not a de Polignac number, because 28761213 - 2² = 28761209 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28761223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7395 + ... + 10592.

It is an arithmetic number, because the mean of its divisors is an integer number (2644236).

Almost surely, 2^28761213 is an apocalyptic number.

It is an amenable number.

28761213 is a deficient number, since it is larger than the sum of its proper divisors (13546563).

28761213 is a wasteful number, since it uses less digits than its factorization.

28761213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18044.

The product of its digits is 4032, while the sum is 30.

The square root of 28761213 is about 5362.9481630909. The cubic root of 28761213 is about 306.3861053776.

Adding to 28761213 its reverse (31216782), we get a palindrome (59977995).

The spelling of 28761213 in words is "twenty-eight million, seven hundred sixty-one thousand, two hundred thirteen".