28436039 has 4 divisors (see below), whose sum is σ = 28653240. Its totient is φ = 28218840.

The previous prime is 28436003. The next prime is 28436047. The reversal of 28436039 is 93063482.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28436039 - 2⁸ = 28435783 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 (28436059) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 108404 + ... + 108665.

It is an arithmetic number, because the mean of its divisors is an integer number (7163310).

Almost surely, 2^28436039 is an apocalyptic number.

28436039 is a deficient number, since it is larger than the sum of its proper divisors (217201).

28436039 is a wasteful number, since it uses less digits than its factorization.

28436039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217200.

The product of its (nonzero) digits is 31104, while the sum is 35.

The square root of 28436039 is about 5332.5452646930. The cubic root of 28436039 is about 305.2270601604.

The spelling of 28436039 in words is "twenty-eight million, four hundred thirty-six thousand, thirty-nine".