28906406007205 has 8 divisors (see below), whose sum is σ = 34707703195512. Its totient is φ = 23111780814528.

The previous prime is 28906406007203. The next prime is 28906406007221. The reversal of 28906406007205 is 50270060460982.

It can be written as a sum of positive squares in 4 ways, for example, as 6428623333729 + 22477782673476 = 2535473^2 + 4741074^2 .

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 28906406007205 - 2¹ = 28906406007203 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 (28906406007203) 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, 1667989374 + ... + 1668006703.

It is an arithmetic number, because the mean of its divisors is an integer number (4338462899439).

Almost surely, 2^{28906406007205} is an apocalyptic number.

It is an amenable number.

28906406007205 is a deficient number, since it is larger than the sum of its proper divisors (5801297188307).

28906406007205 is a wasteful number, since it uses less digits than its factorization.

28906406007205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3335997815.

The product of its (nonzero) digits is 1451520, while the sum is 49.

The spelling of 28906406007205 in words is "twenty-eight trillion, nine hundred six billion, four hundred six million, seven thousand, two hundred five".