28900997 has 2 divisors, whose sum is σ = 28900998. Its totient is φ = 28900996.

The previous prime is 28900987. The next prime is 28901017. The reversal of 28900997 is 79900982.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27888961 + 1012036 = 5281^2 + 1006^2 .

It is a cyclic number.

It is not a de Polignac number, because 28900997 - 2⁴ = 28900981 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28900987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14450498 + 14450499.

It is an arithmetic number, because the mean of its divisors is an integer number (14450499).

Almost surely, 2^28900997 is an apocalyptic number.

It is an amenable number.

28900997 is a deficient number, since it is larger than the sum of its proper divisors (1).

28900997 is an equidigital number, since it uses as much as digits as its factorization.

28900997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 81648, while the sum is 44.

The square root of 28900997 is about 5375.9647506285. The cubic root of 28900997 is about 306.8816648973.

The spelling of 28900997 in words is "twenty-eight million, nine hundred thousand, nine hundred ninety-seven".