28604618641 has 3 divisors (see below), whose sum is σ = 28604787771. Its totient is φ = 28604449512.

The previous prime is 28604618639. The next prime is 28604618717. The reversal of 28604618641 is 14681640682.

The square root of 28604618641 is 169129.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 14681640682 = 2 ⋅7340820341.

It can be written as a sum of positive squares in only one way, i.e., 1774178641 + 26830440000 = 42121^2 + 163800^2 .

It is not a de Polignac number, because 28604618641 - 2¹ = 28604618639 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28604618591 and 28604618600.

It is not an unprimeable number, because it can be changed into a prime (28604718641) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 84565 + ... + 253693.

It is an arithmetic number, because the mean of its divisors is an integer number (9534929257).

Almost surely, 2^28604618641 is an apocalyptic number.

28604618641 is the 169129-th square number.

28604618641 is the 84565-th centered octagonal number.

It is an amenable number.

28604618641 is a deficient number, since it is larger than the sum of its proper divisors (169130).

28604618641 is an frugal number, since it uses more digits than its factorization.

28604618641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 338258 (or 169129 counting only the distinct ones).

The product of its (nonzero) digits is 442368, while the sum is 46.

The spelling of 28604618641 in words is "twenty-eight billion, six hundred four million, six hundred eighteen thousand, six hundred forty-one".