28984973907969 has 20 divisors (see below), whose sum is σ = 43298701809220. Its totient is φ = 19323244293120.

The previous prime is 28984973907943. The next prime is 28984973907997. The reversal of 28984973907969 is 96970937948982.

28984973907969 is a `hidden beast` number, since 2 + 8 + 9 + 8 + 4 + 97 + 390 + 79 + 69 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 14036412110400 + 14948561797569 = 3746520^2 + 3866337^2 .

It is not a de Polignac number, because 28984973907969 - 2⁹ = 28984973907457 is a prime.

It is a super-2 number, since 2×28984973907969² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28984973507969) 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 19 ways as a sum of consecutive naturals, for example, 30030249 + ... + 30980409.

It is an arithmetic number, because the mean of its divisors is an integer number (2164935090461).

Almost surely, 2^{28984973907969} is an apocalyptic number.

It is an amenable number.

28984973907969 is a deficient number, since it is larger than the sum of its proper divisors (14313727901251).

28984973907969 is an equidigital number, since it uses as much as digits as its factorization.

28984973907969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1326782 (or 1326773 counting only the distinct ones).

The product of its (nonzero) digits is 26665583616, while the sum is 90.

The spelling of 28984973907969 in words is "twenty-eight trillion, nine hundred eighty-four billion, nine hundred seventy-three million, nine hundred seven thousand, nine hundred sixty-nine".