28961235 has 12 divisors (see below), whose sum is σ = 50199552. Its totient is φ = 15445968.

The previous prime is 28961213. The next prime is 28961237. The reversal of 28961235 is 53216982.

28961235 is a `hidden beast` number, since 2 + 8 + 9 + 612 + 35 = 666.

It is not a de Polignac number, because 28961235 - 2¹¹ = 28959187 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28961235.

It is not an unprimeable number, because it can be changed into a prime (28961237) 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, 321747 + ... + 321836.

It is an arithmetic number, because the mean of its divisors is an integer number (4183296).

Almost surely, 2^28961235 is an apocalyptic number.

28961235 is a deficient number, since it is larger than the sum of its proper divisors (21238317).

28961235 is a wasteful number, since it uses less digits than its factorization.

28961235 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 643594 (or 643591 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The square root of 28961235 is about 5381.5643636400. The cubic root of 28961235 is about 307.0947268578.

The spelling of 28961235 in words is "twenty-eight million, nine hundred sixty-one thousand, two hundred thirty-five".