28303733646991 has 8 divisors (see below), whose sum is σ = 31711308459984. Its totient is φ = 25035243520320.

The previous prime is 28303733646971. The next prime is 28303733647019. The reversal of 28303733646991 is 19964633730382.

It is a happy number.

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

It is not a de Polignac number, because 28303733646991 - 2¹¹ = 28303733644943 is a prime.

It is a super-2 number, since 2×28303733646991² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28303733646971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34771171150 + ... + 34771171963.

It is an arithmetic number, because the mean of its divisors is an integer number (3963913557498).

Almost surely, 2^{28303733646991} is an apocalyptic number.

28303733646991 is a deficient number, since it is larger than the sum of its proper divisors (3407574812993).

28303733646991 is a wasteful number, since it uses less digits than its factorization.

28303733646991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69542343161.

The product of its (nonzero) digits is 105815808, while the sum is 64.

The spelling of 28303733646991 in words is "twenty-eight trillion, three hundred three billion, seven hundred thirty-three million, six hundred forty-six thousand, nine hundred ninety-one".