28751341661 has 4 divisors (see below), whose sum is σ = 32858676192. Its totient is φ = 24644007132.

The previous prime is 28751341657. The next prime is 28751341673. The reversal of 28751341661 is 16614315782.

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 28751341661 - 2² = 28751341657 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 (28751341601) 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, 2053667255 + ... + 2053667268.

It is an arithmetic number, because the mean of its divisors is an integer number (8214669048).

Almost surely, 2^28751341661 is an apocalyptic number.

It is an amenable number.

28751341661 is a deficient number, since it is larger than the sum of its proper divisors (4107334531).

28751341661 is an equidigital number, since it uses as much as digits as its factorization.

28751341661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4107334530.

The product of its digits is 241920, while the sum is 44.

The spelling of 28751341661 in words is "twenty-eight billion, seven hundred fifty-one million, three hundred forty-one thousand, six hundred sixty-one".