28301921 has 8 divisors (see below), whose sum is σ = 28769664. Its totient is φ = 27837360.

The previous prime is 28301893. The next prime is 28301951. The reversal of 28301921 is 12910382.

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 28301921 - 2⁶ = 28301857 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28301951) 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, 22376 + ... + 23606.

It is an arithmetic number, because the mean of its divisors is an integer number (3596208).

Almost surely, 2^28301921 is an apocalyptic number.

It is an amenable number.

28301921 is a deficient number, since it is larger than the sum of its proper divisors (467743).

28301921 is a wasteful number, since it uses less digits than its factorization.

28301921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1591.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 28301921 is about 5319.9549810125. The cubic root of 28301921 is about 304.7464380098.

The spelling of 28301921 in words is "twenty-eight million, three hundred one thousand, nine hundred twenty-one".