28989673 has 2 divisors, whose sum is σ = 28989674. Its totient is φ = 28989672.

The previous prime is 28989661. The next prime is 28989677. The reversal of 28989673 is 37698982.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20539024 + 8450649 = 4532^2 + 2907^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28989673 is a prime.

It is a super-2 number, since 2×28989673² = 1680802281293858, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 28989673.

It is not a weakly prime, because it can be changed into another prime (28989677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14494836 + 14494837.

It is an arithmetic number, because the mean of its divisors is an integer number (14494837).

Almost surely, 2^28989673 is an apocalyptic number.

It is an amenable number.

28989673 is a deficient number, since it is larger than the sum of its proper divisors (1).

28989673 is an equidigital number, since it uses as much as digits as its factorization.

28989673 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1306368, while the sum is 52.

The square root of 28989673 is about 5384.2058838793. The cubic root of 28989673 is about 307.1952094850.

The spelling of 28989673 in words is "twenty-eight million, nine hundred eighty-nine thousand, six hundred seventy-three".