28346260909 has 4 divisors (see below), whose sum is σ = 28355346460. Its totient is φ = 28337175360.

The previous prime is 28346260879. The next prime is 28346260931. The reversal of 28346260909 is 90906264382.

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 4791685284 + 23554575625 = 69222^2 + 153475^2 .

It is a cyclic number.

It is not a de Polignac number, because 28346260909 - 2¹¹ = 28346258861 is a prime.

It is a super-2 number, since 2×28346260909² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28346860909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4538094 + ... + 4544335.

It is an arithmetic number, because the mean of its divisors is an integer number (7088836615).

Almost surely, 2^28346260909 is an apocalyptic number.

It is an amenable number.

28346260909 is a deficient number, since it is larger than the sum of its proper divisors (9085551).

28346260909 is an equidigital number, since it uses as much as digits as its factorization.

28346260909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9085550.

The product of its (nonzero) digits is 1119744, while the sum is 49.

The spelling of 28346260909 in words is "twenty-eight billion, three hundred forty-six million, two hundred sixty thousand, nine hundred nine".