28860005 has 8 divisors (see below), whose sum is σ = 34665624. Its totient is φ = 23065600.

The previous prime is 28860001. The next prime is 28860019. The reversal of 28860005 is 50006882.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 5982916 + 22877089 = 2446^2 + 4783^2 .

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

It is not a de Polignac number, because 28860005 - 2² = 28860001 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 28860005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28860001) 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, 4685 + ... + 8925.

It is an arithmetic number, because the mean of its divisors is an integer number (4333203).

Almost surely, 2^28860005 is an apocalyptic number.

It is an amenable number.

28860005 is a deficient number, since it is larger than the sum of its proper divisors (5805619).

28860005 is a wasteful number, since it uses less digits than its factorization.

28860005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5607.

The product of its (nonzero) digits is 3840, while the sum is 29.

The square root of 28860005 is about 5372.1508727883. The cubic root of 28860005 is about 306.7365067515.

Adding to 28860005 its reverse (50006882), we get a palindrome (78866887).

The spelling of 28860005 in words is "twenty-eight million, eight hundred sixty thousand, five".