28988999 has 8 divisors (see below), whose sum is σ = 32226432. Its totient is φ = 25895520.

The previous prime is 28988977. The next prime is 28989007. The reversal of 28988999 is 99988982.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28988999 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28988929) 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, 35564 + ... + 36369.

It is an arithmetic number, because the mean of its divisors is an integer number (4028304).

Almost surely, 2^28988999 is an apocalyptic number.

28988999 is a deficient number, since it is larger than the sum of its proper divisors (3237433).

28988999 is a wasteful number, since it uses less digits than its factorization.

28988999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71977.

The product of its digits is 6718464, while the sum is 62.

The square root of 28988999 is about 5384.1432930412. The cubic root of 28988999 is about 307.1928287386.

The spelling of 28988999 in words is "twenty-eight million, nine hundred eighty-eight thousand, nine hundred ninety-nine".