28054821 has 8 divisors (see below), whose sum is σ = 37595200. Its totient is φ = 18608832.

The previous prime is 28054813. The next prime is 28054841. The reversal of 28054821 is 12845082.

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

It is not a de Polignac number, because 28054821 - 2³ = 28054813 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 (28054841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22900 + ... + 24093.

It is an arithmetic number, because the mean of its divisors is an integer number (4699400).

Almost surely, 2^28054821 is an apocalyptic number.

It is an amenable number.

28054821 is a deficient number, since it is larger than the sum of its proper divisors (9540379).

28054821 is a wasteful number, since it uses less digits than its factorization.

28054821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47195.

The product of its (nonzero) digits is 5120, while the sum is 30.

The square root of 28054821 is about 5296.6801866830. The cubic root of 28054821 is about 303.8569451868.

It can be divided in two parts, 2805 and 4821, that added together give a triangular number (7626 = T₁₂₃).

The spelling of 28054821 in words is "twenty-eight million, fifty-four thousand, eight hundred twenty-one".