28750111 has 12 divisors (see below), whose sum is σ = 32966352. Its totient is φ = 24974976.

The previous prime is 28750109. The next prime is 28750123. The reversal of 28750111 is 11105782.

It is not a de Polignac number, because 28750111 - 2¹ = 28750109 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 (28750411) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2131 + ... + 7876.

It is an arithmetic number, because the mean of its divisors is an integer number (2747196).

Almost surely, 2^28750111 is an apocalyptic number.

28750111 is a deficient number, since it is larger than the sum of its proper divisors (4216241).

28750111 is a wasteful number, since it uses less digits than its factorization.

28750111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10050 (or 10037 counting only the distinct ones).

The product of its (nonzero) digits is 560, while the sum is 25.

The square root of 28750111 is about 5361.9129981752. The cubic root of 28750111 is about 306.3466780153.

Adding to 28750111 its reverse (11105782), we get a palindrome (39855893).

The spelling of 28750111 in words is "twenty-eight million, seven hundred fifty thousand, one hundred eleven".