28980111 has 16 divisors (see below), whose sum is σ = 40809600. Its totient is φ = 18242208.

The previous prime is 28980109. The next prime is 28980131. The reversal of 28980111 is 11108982.

It is not a de Polignac number, because 28980111 - 2¹ = 28980109 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28980101) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21520 + ... + 22826.

It is an arithmetic number, because the mean of its divisors is an integer number (2550600).

Almost surely, 2^28980111 is an apocalyptic number.

28980111 is a deficient number, since it is larger than the sum of its proper divisors (11829489).

28980111 is a wasteful number, since it uses less digits than its factorization.

28980111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1718.

The product of its (nonzero) digits is 1152, while the sum is 30.

The square root of 28980111 is about 5383.3178431150. The cubic root of 28980111 is about 307.1614305181.

The spelling of 28980111 in words is "twenty-eight million, nine hundred eighty thousand, one hundred eleven".