28200639 has 8 divisors (see below), whose sum is σ = 37630080. Its totient is φ = 18785816.

The previous prime is 28200631. The next prime is 28200649. The reversal of 28200639 is 93600282.

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

It is a cyclic number.

It is not a de Polignac number, because 28200639 - 2³ = 28200631 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28200631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2182 + ... + 7820.

It is an arithmetic number, because the mean of its divisors is an integer number (4703760).

Almost surely, 2^28200639 is an apocalyptic number.

28200639 is a deficient number, since it is larger than the sum of its proper divisors (9429441).

28200639 is a wasteful number, since it uses less digits than its factorization.

28200639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7309.

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 28200639 is about 5310.4273839306. The cubic root of 28200639 is about 304.3824789626.

The spelling of 28200639 in words is "twenty-eight million, two hundred thousand, six hundred thirty-nine".