28761809872 has 20 divisors (see below), whose sum is σ = 56017771776. Its totient is φ = 14305610720.

The previous prime is 28761809803. The next prime is 28761809899. The reversal of 28761809872 is 27890816782.

It is a super-2 number, since 2×28761809872² (a number of 22 digits) contains 22 as substring.

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, 4702738 + ... + 4708849.

Almost surely, 2^28761809872 is an apocalyptic number.

It is an amenable number.

28761809872 is a deficient number, since it is larger than the sum of its proper divisors (27255961904).

28761809872 is a wasteful number, since it uses less digits than its factorization.

28761809872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9411786 (or 9411780 counting only the distinct ones).

The product of its (nonzero) digits is 5419008, while the sum is 58.

The spelling of 28761809872 in words is "twenty-eight billion, seven hundred sixty-one million, eight hundred nine thousand, eight hundred seventy-two".