28998989 has 2 divisors, whose sum is σ = 28998990. Its totient is φ = 28998988.

The previous prime is 28998979. The next prime is 28999001. The reversal of 28998989 is 98989982.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27352900 + 1646089 = 5230^2 + 1283^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28998989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28998979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14499494 + 14499495.

It is an arithmetic number, because the mean of its divisors is an integer number (14499495).

Almost surely, 2^28998989 is an apocalyptic number.

It is an amenable number.

28998989 is a deficient number, since it is larger than the sum of its proper divisors (1).

28998989 is an equidigital number, since it uses as much as digits as its factorization.

28998989 is an evil number, because the sum of its binary digits is even.

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

The square root of 28998989 is about 5385.0709373229. The cubic root of 28998989 is about 307.2281122831.

The spelling of 28998989 in words is "twenty-eight million, nine hundred ninety-eight thousand, nine hundred eighty-nine".