28371621 has 8 divisors (see below), whose sum is σ = 37999360. Its totient is φ = 18829152.

The previous prime is 28371583. The next prime is 28371647. The reversal of 28371621 is 12617382.

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

It is not a de Polignac number, because 28371621 - 2⁶ = 28371557 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 (28370621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20536 + ... + 21873.

It is an arithmetic number, because the mean of its divisors is an integer number (4749920).

Almost surely, 2^28371621 is an apocalyptic number.

It is an amenable number.

28371621 is a deficient number, since it is larger than the sum of its proper divisors (9627739).

28371621 is a wasteful number, since it uses less digits than its factorization.

28371621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42635.

The product of its digits is 4032, while the sum is 30.

The square root of 28371621 is about 5326.5017600673. The cubic root of 28371621 is about 304.9964023584.

The spelling of 28371621 in words is "twenty-eight million, three hundred seventy-one thousand, six hundred twenty-one".