28126939405 has 8 divisors (see below), whose sum is σ = 33753252600. Its totient is φ = 22500934656.

The previous prime is 28126939349. The next prime is 28126939441. The reversal of 28126939405 is 50493962182.

It can be written as a sum of positive squares in 4 ways, for example, as 1866412804 + 26260526601 = 43202^2 + 162051^2 .

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 28126939405 - 2⁷ = 28126939277 is a prime.

It is a super-2 number, since 2×28126939405² (a number of 22 digits) contains 22 as substring.

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, 248541 + ... + 343549.

It is an arithmetic number, because the mean of its divisors is an integer number (4219156575).

Almost surely, 2^28126939405 is an apocalyptic number.

It is an amenable number.

28126939405 is a deficient number, since it is larger than the sum of its proper divisors (5626313195).

28126939405 is an equidigital number, since it uses as much as digits as its factorization.

28126939405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154223.

The product of its (nonzero) digits is 933120, while the sum is 49.

The spelling of 28126939405 in words is "twenty-eight billion, one hundred twenty-six million, nine hundred thirty-nine thousand, four hundred five".