28993999 has 2 divisors, whose sum is σ = 28994000. Its totient is φ = 28993998.

The previous prime is 28993967. The next prime is 28994047. The reversal of 28993999 is 99939982.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28993999 - 2⁵ = 28993967 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28993949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14496999 + 14497000.

It is an arithmetic number, because the mean of its divisors is an integer number (14497000).

Almost surely, 2^28993999 is an apocalyptic number.

28993999 is a deficient number, since it is larger than the sum of its proper divisors (1).

28993999 is an equidigital number, since it uses as much as digits as its factorization.

28993999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2834352, while the sum is 58.

The square root of 28993999 is about 5384.6075994449. The cubic root of 28993999 is about 307.2104891834.

It can be divided in two parts, 28993 and 999, that added together give a palindrome (29992).

The spelling of 28993999 in words is "twenty-eight million, nine hundred ninety-three thousand, nine hundred ninety-nine".