28838021 has 8 divisors (see below), whose sum is σ = 30370560. Its totient is φ = 27328752.

The previous prime is 28838011. The next prime is 28838023. The reversal of 28838021 is 12083882.

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 28838021 - 2⁶ = 28837957 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 (28838023) 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, 3245 + ... + 8258.

It is an arithmetic number, because the mean of its divisors is an integer number (3796320).

Almost surely, 2^28838021 is an apocalyptic number.

It is an amenable number.

28838021 is a deficient number, since it is larger than the sum of its proper divisors (1532539).

28838021 is a wasteful number, since it uses less digits than its factorization.

28838021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11635.

The product of its (nonzero) digits is 6144, while the sum is 32.

The square root of 28838021 is about 5370.1043751495. The cubic root of 28838021 is about 306.6586018411.

The spelling of 28838021 in words is "twenty-eight million, eight hundred thirty-eight thousand, twenty-one".