28625987785 has 8 divisors (see below), whose sum is σ = 34394838336. Its totient is φ = 22871688240.

The previous prime is 28625987779. The next prime is 28625987807. The reversal of 28625987785 is 58778952682.

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

It is not a de Polignac number, because 28625987785 - 2¹⁷ = 28625856713 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28625987785.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 3633421 + ... + 3641290.

It is an arithmetic number, because the mean of its divisors is an integer number (4299354792).

Almost surely, 2^28625987785 is an apocalyptic number.

It is an amenable number.

28625987785 is a deficient number, since it is larger than the sum of its proper divisors (5768850551).

28625987785 is an equidigital number, since it uses as much as digits as its factorization.

28625987785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7275503.

The product of its digits is 135475200, while the sum is 67.

The spelling of 28625987785 in words is "twenty-eight billion, six hundred twenty-five million, nine hundred eighty-seven thousand, seven hundred eighty-five".