28918342577 has 4 divisors (see below), whose sum is σ = 28918927716. Its totient is φ = 28917757440.

The previous prime is 28918342573. The next prime is 28918342601. The reversal of 28918342577 is 77524381982.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 77524381982 = 2 ⋅38762190991.

It can be written as a sum of positive squares in 2 ways, for example, as 15154594816 + 13763747761 = 123104^2 + 117319^2 .

It is a cyclic number.

It is not a de Polignac number, because 28918342577 - 2² = 28918342573 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28918342573) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 210824 + ... + 319817.

It is an arithmetic number, because the mean of its divisors is an integer number (7229731929).

Almost surely, 2^28918342577 is an apocalyptic number.

It is an amenable number.

28918342577 is a deficient number, since it is larger than the sum of its proper divisors (585139).

28918342577 is an equidigital number, since it uses as much as digits as its factorization.

28918342577 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 585138.

The product of its digits is 6773760, while the sum is 56.

The spelling of 28918342577 in words is "twenty-eight billion, nine hundred eighteen million, three hundred forty-two thousand, five hundred seventy-seven".