28059991405 has 8 divisors (see below), whose sum is σ = 33684255000. Its totient is φ = 22439816256.

The previous prime is 28059991387. The next prime is 28059991411. The reversal of 28059991405 is 50419995082.

It can be written as a sum of positive squares in 4 ways, for example, as 414611044 + 27645380361 = 20362^2 + 166269^2 .

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 28059991405 - 2¹⁵ = 28059958637 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1006990 + ... + 1034479.

It is an arithmetic number, because the mean of its divisors is an integer number (4210531875).

Almost surely, 2^28059991405 is an apocalyptic number.

It is an amenable number.

28059991405 is a deficient number, since it is larger than the sum of its proper divisors (5624263595).

28059991405 is a wasteful number, since it uses less digits than its factorization.

28059991405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2044223.

The product of its (nonzero) digits is 1166400, while the sum is 52.

The spelling of 28059991405 in words is "twenty-eight billion, fifty-nine million, nine hundred ninety-one thousand, four hundred five".