28147793 has 2 divisors, whose sum is σ = 28147794. Its totient is φ = 28147792.

The previous prime is 28147781. The next prime is 28147807. The reversal of 28147793 is 39774182.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25230529 + 2917264 = 5023^2 + 1708^2 .

It is a cyclic number.

It is not a de Polignac number, because 28147793 - 2¹⁴ = 28131409 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 28147793.

It is not a weakly prime, because it can be changed into another prime (28147703) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14073896 + 14073897.

It is an arithmetic number, because the mean of its divisors is an integer number (14073897).

Almost surely, 2^28147793 is an apocalyptic number.

It is an amenable number.

28147793 is a deficient number, since it is larger than the sum of its proper divisors (1).

28147793 is an equidigital number, since it uses as much as digits as its factorization.

28147793 is an evil number, because the sum of its binary digits is even.

The product of its digits is 84672, while the sum is 41.

The square root of 28147793 is about 5305.4493683382. The cubic root of 28147793 is about 304.1922296732.

The spelling of 28147793 in words is "twenty-eight million, one hundred forty-seven thousand, seven hundred ninety-three".