28021441 has 8 divisors (see below), whose sum is σ = 32076864. Its totient is φ = 23979120.

The previous prime is 28021421. The next prime is 28021501. The reversal of 28021441 is 14412082.

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 28021441 - 2⁷ = 28021313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28021421) 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, 1851 + ... + 7711.

It is an arithmetic number, because the mean of its divisors is an integer number (4009608).

Almost surely, 2^28021441 is an apocalyptic number.

It is an amenable number.

28021441 is a deficient number, since it is larger than the sum of its proper divisors (4055423).

28021441 is an equidigital number, since it uses as much as digits as its factorization.

28021441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6551.

The product of its (nonzero) digits is 512, while the sum is 22.

The square root of 28021441 is about 5293.5282184947. The cubic root of 28021441 is about 303.7363863453.

The spelling of 28021441 in words is "twenty-eight million, twenty-one thousand, four hundred forty-one".