28396326661 has 4 divisors (see below), whose sum is σ = 29000503872. Its totient is φ = 27792149452.

The previous prime is 28396326613. The next prime is 28396326683. The reversal of 28396326661 is 16662369382.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28396326661 - 2¹³ = 28396318469 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28396326599 and 28396326608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28396323661) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 302088535 + ... + 302088628.

It is an arithmetic number, because the mean of its divisors is an integer number (7250125968).

Almost surely, 2^28396326661 is an apocalyptic number.

It is an amenable number.

28396326661 is a deficient number, since it is larger than the sum of its proper divisors (604177211).

28396326661 is an equidigital number, since it uses as much as digits as its factorization.

28396326661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 604177210.

The product of its digits is 3359232, while the sum is 52.

The spelling of 28396326661 in words is "twenty-eight billion, three hundred ninety-six million, three hundred twenty-six thousand, six hundred sixty-one".