28805786507 has 12 divisors (see below), whose sum is σ = 30128809776. Its totient is φ = 27537031200.

The previous prime is 28805786501. The next prime is 28805786543. The reversal of 28805786507 is 70568750882.

It is not a de Polignac number, because 28805786507 - 2⁴ = 28805786491 is a prime.

It is a super-2 number, since 2×28805786507² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28805786501) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 84623 + ... + 254504.

It is an arithmetic number, because the mean of its divisors is an integer number (2510734148).

Almost surely, 2^28805786507 is an apocalyptic number.

28805786507 is a deficient number, since it is larger than the sum of its proper divisors (1323023269).

28805786507 is a wasteful number, since it uses less digits than its factorization.

28805786507 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 339286 (or 339257 counting only the distinct ones).

The product of its (nonzero) digits is 7526400, while the sum is 56.

The spelling of 28805786507 in words is "twenty-eight billion, eight hundred five million, seven hundred eighty-six thousand, five hundred seven".