28900621 has 8 divisors (see below), whose sum is σ = 29450304. Its totient is φ = 28355040.

The previous prime is 28900607. The next prime is 28900631. The reversal of 28900621 is 12600982.

It is a happy number.

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 28900621 - 2¹³ = 28892429 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28900621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28900631) 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, 15670 + ... + 17416.

It is an arithmetic number, because the mean of its divisors is an integer number (3681288).

Almost surely, 2^28900621 is an apocalyptic number.

It is an amenable number.

28900621 is a deficient number, since it is larger than the sum of its proper divisors (549683).

28900621 is a wasteful number, since it uses less digits than its factorization.

28900621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2051.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 28900621 is about 5375.9297800474. The cubic root of 28900621 is about 306.8803340550.

The spelling of 28900621 in words is "twenty-eight million, nine hundred thousand, six hundred twenty-one".