28750211 has 12 divisors (see below), whose sum is σ = 35205480. Its totient is φ = 23345280.

The previous prime is 28750201. The next prime is 28750217. The reversal of 28750211 is 11205782.

It is not a de Polignac number, because 28750211 - 2¹⁰ = 28749187 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28750217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14510 + ... + 16371.

It is an arithmetic number, because the mean of its divisors is an integer number (2933790).

Almost surely, 2^28750211 is an apocalyptic number.

28750211 is a deficient number, since it is larger than the sum of its proper divisors (6455269).

28750211 is a wasteful number, since it uses less digits than its factorization.

28750211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30914 (or 30907 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 26.

The square root of 28750211 is about 5361.9223231972. The cubic root of 28750211 is about 306.3470331980.

Adding to 28750211 its reverse (11205782), we get a palindrome (39955993).

The spelling of 28750211 in words is "twenty-eight million, seven hundred fifty thousand, two hundred eleven".