28604694931609 has 8 divisors (see below), whose sum is σ = 28636359689160. Its totient is φ = 28573032055296.

The previous prime is 28604694931543. The next prime is 28604694931627. The reversal of 28604694931609 is 90613949640682.

It can be written as a sum of positive squares in 4 ways, for example, as 97606256400 + 28507088675209 = 312420^2 + 5339203^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28604694931609 - 2⁹ = 28604694931097 is a prime.

It is a super-2 number, since 2×28604694931609² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28604694931669) 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 7 ways as a sum of consecutive naturals, for example, 31130367 + ... + 32036059.

It is an arithmetic number, because the mean of its divisors is an integer number (3579544961145).

Almost surely, 2^{28604694931609} is an apocalyptic number.

It is an amenable number.

28604694931609 is a deficient number, since it is larger than the sum of its proper divisors (31664757551).

28604694931609 is an equidigital number, since it uses as much as digits as its factorization.

28604694931609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 940619.

The product of its (nonzero) digits is 120932352, while the sum is 67.

The spelling of 28604694931609 in words is "twenty-eight trillion, six hundred four billion, six hundred ninety-four million, nine hundred thirty-one thousand, six hundred nine".