28235639 has 8 divisors (see below), whose sum is σ = 28557360. Its totient is φ = 27916096.

The previous prime is 28235629. The next prime is 28235659. The reversal of 28235639 is 93653282.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28235639 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 (28235629) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41369 + ... + 42045.

It is an arithmetic number, because the mean of its divisors is an integer number (3569670).

Almost surely, 2^28235639 is an apocalyptic number.

28235639 is a deficient number, since it is larger than the sum of its proper divisors (321721).

28235639 is a wasteful number, since it uses less digits than its factorization.

28235639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1089.

The product of its digits is 77760, while the sum is 38.

The square root of 28235639 is about 5313.7217653919. The cubic root of 28235639 is about 304.5083506077.

The spelling of 28235639 in words is "twenty-eight million, two hundred thirty-five thousand, six hundred thirty-nine".