28408772685 has 16 divisors (see below), whose sum is σ = 46199185920. Its totient is φ = 14902962240.

The previous prime is 28408772683. The next prime is 28408772699. The reversal of 28408772685 is 58627780482.

It is not a de Polignac number, because 28408772685 - 2¹ = 28408772683 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28408772683) 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 15 ways as a sum of consecutive naturals, for example, 15523005 + ... + 15524834.

It is an arithmetic number, because the mean of its divisors is an integer number (2887449120).

Almost surely, 2^28408772685 is an apocalyptic number.

It is an amenable number.

28408772685 is a deficient number, since it is larger than the sum of its proper divisors (17790413235).

28408772685 is a wasteful number, since it uses less digits than its factorization.

28408772685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31047908.

The product of its (nonzero) digits is 12042240, while the sum is 57.

The spelling of 28408772685 in words is "twenty-eight billion, four hundred eight million, seven hundred seventy-two thousand, six hundred eighty-five".