28911983 has 2 divisors, whose sum is σ = 28911984. Its totient is φ = 28911982.

The previous prime is 28911973. The next prime is 28912001. The reversal of 28911983 is 38911982.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28911983 - 2⁶ = 28911919 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28911983.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28911973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14455991 + 14455992.

It is an arithmetic number, because the mean of its divisors is an integer number (14455992).

Almost surely, 2^28911983 is an apocalyptic number.

28911983 is a deficient number, since it is larger than the sum of its proper divisors (1).

28911983 is an equidigital number, since it uses as much as digits as its factorization.

28911983 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31104, while the sum is 41.

The square root of 28911983 is about 5376.9864236392. The cubic root of 28911983 is about 306.9205444658.

Subtracting 28911983 from its reverse (38911982), we obtain a palindrome (9999999).

The spelling of 28911983 in words is "twenty-eight million, nine hundred eleven thousand, nine hundred eighty-three".