28235556 has 18 divisors (see below), whose sum is σ = 71373302. Its totient is φ = 9411840.

The previous prime is 28235533. The next prime is 28235561. The reversal of 28235556 is 65553282.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 17892900 + 10342656 = 4230^2 + 3216^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 784321 = 28235556 / (2 + 8 + 2 + 3 + 5 + 5 + 5 + 6).

It is a self number, because there is not a number n which added to its sum of digits gives 28235556.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 392125 + ... + 392196.

Almost surely, 2^28235556 is an apocalyptic number.

It is an amenable number.

28235556 is an abundant number, since it is smaller than the sum of its proper divisors (43137746).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28235556 is a wasteful number, since it uses less digits than its factorization.

28235556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 784331 (or 784326 counting only the distinct ones).

The product of its digits is 72000, while the sum is 36.

The square root of 28235556 is about 5313.7139554176. The cubic root of 28235556 is about 304.5080522352.

The spelling of 28235556 in words is "twenty-eight million, two hundred thirty-five thousand, five hundred fifty-six".