28988858991 has 8 divisors (see below), whose sum is σ = 38654918784. Its totient is φ = 19324352600.

The previous prime is 28988858953. The next prime is 28988859047. The reversal of 28988858991 is 19985888982.

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

It is a cyclic number.

It is not a de Polignac number, because 28988858991 - 2⁷ = 28988858863 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28988858791) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 344085 + ... + 419966.

It is an arithmetic number, because the mean of its divisors is an integer number (4831864848).

Almost surely, 2^28988858991 is an apocalyptic number.

28988858991 is a deficient number, since it is larger than the sum of its proper divisors (9666059793).

28988858991 is a wasteful number, since it uses less digits than its factorization.

28988858991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 776701.

The product of its digits is 238878720, while the sum is 75.

The spelling of 28988858991 in words is "twenty-eight billion, nine hundred eighty-eight million, eight hundred fifty-eight thousand, nine hundred ninety-one".