28691805975 has 96 divisors (see below), whose sum is σ = 57499843584. Its totient is φ = 12339993600.

The previous prime is 28691805973. The next prime is 28691805997. The reversal of 28691805975 is 57950819682.

It is not a de Polignac number, because 28691805975 - 2¹ = 28691805973 is a prime.

It is a Smith number, since the sum of its digits (60) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28691805973) 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 95 ways as a sum of consecutive naturals, for example, 717099 + ... + 756051.

It is an arithmetic number, because the mean of its divisors is an integer number (598956704).

Almost surely, 2^28691805975 is an apocalyptic number.

28691805975 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28691805975 is an abundant number, since it is smaller than the sum of its proper divisors (28808037609).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28691805975 is a wasteful number, since it uses less digits than its factorization.

28691805975 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39057 (or 39052 counting only the distinct ones).

The product of its (nonzero) digits is 10886400, while the sum is 60.

The spelling of 28691805975 in words is "twenty-eight billion, six hundred ninety-one million, eight hundred five thousand, nine hundred seventy-five".