28914817 has 4 divisors (see below), whose sum is σ = 28928260. Its totient is φ = 28901376.

The previous prime is 28914811. The next prime is 28914857. The reversal of 28914817 is 71841982.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13868176 + 15046641 = 3724^2 + 3879^2 .

It is a 3-Lehmer number, since φ(28914817) divides (28914817-1)³.

It is a cyclic number.

It is not a de Polignac number, because 28914817 - 2⁷ = 28914689 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 28914817.

It is not an unprimeable number, because it can be changed into a prime (28914811) 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 3 ways as a sum of consecutive naturals, for example, 2688 + ... + 8065.

It is an arithmetic number, because the mean of its divisors is an integer number (7232065).

Almost surely, 2^28914817 is an apocalyptic number.

28914817 is the 2689-th decagonal number.

It is an amenable number.

28914817 is a deficient number, since it is larger than the sum of its proper divisors (13443).

28914817 is a wasteful number, since it uses less digits than its factorization.

28914817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13442.

The product of its digits is 32256, while the sum is 40.

The square root of 28914817 is about 5377.2499476963. The cubic root of 28914817 is about 306.9305724232.

The spelling of 28914817 in words is "twenty-eight million, nine hundred fourteen thousand, eight hundred seventeen".