28274989 has 2 divisors, whose sum is σ = 28274990. Its totient is φ = 28274988.

The previous prime is 28274941. The next prime is 28274999. The reversal of 28274989 is 98947282.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20629764 + 7645225 = 4542^2 + 2765^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28274989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28274929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14137494 + 14137495.

It is an arithmetic number, because the mean of its divisors is an integer number (14137495).

Almost surely, 2^28274989 is an apocalyptic number.

It is an amenable number.

28274989 is a deficient number, since it is larger than the sum of its proper divisors (1).

28274989 is an equidigital number, since it uses as much as digits as its factorization.

28274989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 580608, while the sum is 49.

The square root of 28274989 is about 5317.4231541227. The cubic root of 28274989 is about 304.6497421491.

The spelling of 28274989 in words is "twenty-eight million, two hundred seventy-four thousand, nine hundred eighty-nine".