28025989 has 2 divisors, whose sum is σ = 28025990. Its totient is φ = 28025988.

The previous prime is 28025951. The next prime is 28025999. The reversal of 28025989 is 98952082.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22184100 + 5841889 = 4710^2 + 2417^2 .

It is a cyclic number.

It is not a de Polignac number, because 28025989 - 2¹⁹ = 27501701 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28025929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14012994 + 14012995.

It is an arithmetic number, because the mean of its divisors is an integer number (14012995).

Almost surely, 2^28025989 is an apocalyptic number.

It is an amenable number.

28025989 is a deficient number, since it is larger than the sum of its proper divisors (1).

28025989 is an equidigital number, since it uses as much as digits as its factorization.

28025989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 103680, while the sum is 43.

The square root of 28025989 is about 5293.9577822268. The cubic root of 28025989 is about 303.7528180289.

The spelling of 28025989 in words is "twenty-eight million, twenty-five thousand, nine hundred eighty-nine".