28114021 has 8 divisors (see below), whose sum is σ = 31321080. Its totient is φ = 25056192.

The previous prime is 28114007. The next prime is 28114033. The reversal of 28114021 is 12041182.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 2722500 + 25391521 = 1650^2 + 5039^2 .

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 28114021 - 2⁷ = 28113893 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28114021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28114321) 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, 36910 + ... + 37663.

It is an arithmetic number, because the mean of its divisors is an integer number (3915135).

Almost surely, 2^28114021 is an apocalyptic number.

It is an amenable number.

28114021 is a deficient number, since it is larger than the sum of its proper divisors (3207059).

28114021 is a wasteful number, since it uses less digits than its factorization.

28114021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74615.

The product of its (nonzero) digits is 128, while the sum is 19.

The square root of 28114021 is about 5302.2656478151. The cubic root of 28114021 is about 304.0705233718.

The spelling of 28114021 in words is "twenty-eight million, one hundred fourteen thousand, twenty-one".