28609911 has 12 divisors (see below), whose sum is σ = 45082440. Its totient is φ = 17339280.

The previous prime is 28609883. The next prime is 28609957. The reversal of 28609911 is 11990682.

It is not a de Polignac number, because 28609911 - 2⁵ = 28609879 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28609961) 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, 144396 + ... + 144593.

It is an arithmetic number, because the mean of its divisors is an integer number (3756870).

Almost surely, 2^28609911 is an apocalyptic number.

28609911 is a deficient number, since it is larger than the sum of its proper divisors (16472529).

28609911 is a wasteful number, since it uses less digits than its factorization.

28609911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 289006 (or 289003 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 36.

The square root of 28609911 is about 5348.8233285462. The cubic root of 28609911 is about 305.8478995472.

The spelling of 28609911 in words is "twenty-eight million, six hundred nine thousand, nine hundred eleven".