28200638 has 8 divisors (see below), whose sum is σ = 43665600. Its totient is φ = 13645440.

The previous prime is 28200631. The next prime is 28200649. The reversal of 28200638 is 83600282.

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

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 28200638.

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 polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 227363 + ... + 227486.

It is an arithmetic number, because the mean of its divisors is an integer number (5458200).

Almost surely, 2^28200638 is an apocalyptic number.

28200638 is a deficient number, since it is larger than the sum of its proper divisors (15464962).

28200638 is a wasteful number, since it uses less digits than its factorization.

28200638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 454882.

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 28200638 is about 5310.4272897762. The cubic root of 28200638 is about 304.3824753648.

The spelling of 28200638 in words is "twenty-eight million, two hundred thousand, six hundred thirty-eight".