28897793 has 2 divisors, whose sum is σ = 28897794. Its totient is φ = 28897792.

The previous prime is 28897789. The next prime is 28897801. The reversal of 28897793 is 39779882.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28815424 + 82369 = 5368^2 + 287^2 .

It is a cyclic number.

It is not a de Polignac number, because 28897793 - 2² = 28897789 is a prime.

It is not a weakly prime, because it can be changed into another prime (28894793) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14448896 + 14448897.

It is an arithmetic number, because the mean of its divisors is an integer number (14448897).

Almost surely, 2^28897793 is an apocalyptic number.

It is an amenable number.

28897793 is a deficient number, since it is larger than the sum of its proper divisors (1).

28897793 is an equidigital number, since it uses as much as digits as its factorization.

28897793 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1524096, while the sum is 53.

The square root of 28897793 is about 5375.6667493438. Note that the first 3 decimals coincide. The cubic root of 28897793 is about 306.8703240522.

The spelling of 28897793 in words is "twenty-eight million, eight hundred ninety-seven thousand, seven hundred ninety-three".