28232404685 has 4 divisors (see below), whose sum is σ = 33878885628. Its totient is φ = 22585923744.

The previous prime is 28232404639. The next prime is 28232404691. The reversal of 28232404685 is 58640423282.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11294163076 + 16938241609 = 106274^2 + 130147^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28232404685 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 2823240464 + ... + 2823240473.

It is an arithmetic number, because the mean of its divisors is an integer number (8469721407).

Almost surely, 2^28232404685 is an apocalyptic number.

It is an amenable number.

28232404685 is a deficient number, since it is larger than the sum of its proper divisors (5646480943).

28232404685 is an equidigital number, since it uses as much as digits as its factorization.

28232404685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5646480942.

The product of its (nonzero) digits is 737280, while the sum is 44.

The spelling of 28232404685 in words is "twenty-eight billion, two hundred thirty-two million, four hundred four thousand, six hundred eighty-five".