28945457 has 2 divisors, whose sum is σ = 28945458. Its totient is φ = 28945456.

The previous prime is 28945453. The next prime is 28945463. The reversal of 28945457 is 75454982.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28718881 + 226576 = 5359^2 + 476^2 .

It is a cyclic number.

It is not a de Polignac number, because 28945457 - 2² = 28945453 is a prime.

It is not a weakly prime, because it can be changed into another prime (28945453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14472728 + 14472729.

It is an arithmetic number, because the mean of its divisors is an integer number (14472729).

Almost surely, 2^28945457 is an apocalyptic number.

It is an amenable number.

28945457 is a deficient number, since it is larger than the sum of its proper divisors (1).

28945457 is an equidigital number, since it uses as much as digits as its factorization.

28945457 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 403200, while the sum is 44.

The square root of 28945457 is about 5380.0982333039. The cubic root of 28945457 is about 307.0389486106.

The spelling of 28945457 in words is "twenty-eight million, nine hundred forty-five thousand, four hundred fifty-seven".