28200621 has 8 divisors (see below), whose sum is σ = 37643584. Its totient is φ = 18779040.

The previous prime is 28200593. The next prime is 28200631. The reversal of 28200621 is 12600282.

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

It is not a de Polignac number, because 28200621 - 2¹³ = 28192429 is a prime.

It is a Duffinian number.

It is a Curzon number.

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 7 ways as a sum of consecutive naturals, for example, 1960 + ... + 7761.

It is an arithmetic number, because the mean of its divisors is an integer number (4705448).

Almost surely, 2^28200621 is an apocalyptic number.

It is an amenable number.

28200621 is a deficient number, since it is larger than the sum of its proper divisors (9442963).

28200621 is an equidigital number, since it uses as much as digits as its factorization.

28200621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10691.

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 28200621 is about 5310.4256891515. The cubic root of 28200621 is about 304.3824142018.

The spelling of 28200621 in words is "twenty-eight million, two hundred thousand, six hundred twenty-one".