28147849 has 2 divisors, whose sum is σ = 28147850. Its totient is φ = 28147848.

The previous prime is 28147831. The next prime is 28147859. The reversal of 28147849 is 94874182.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27667600 + 480249 = 5260^2 + 693^2 .

It is a cyclic number.

It is not a de Polignac number, because 28147849 - 2¹⁵ = 28115081 is a prime.

It is not a weakly prime, because it can be changed into another prime (28147859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14073924 + 14073925.

It is an arithmetic number, because the mean of its divisors is an integer number (14073925).

Almost surely, 2^28147849 is an apocalyptic number.

It is an amenable number.

28147849 is a deficient number, since it is larger than the sum of its proper divisors (1).

28147849 is an equidigital number, since it uses as much as digits as its factorization.

28147849 is an evil number, because the sum of its binary digits is even.

The product of its digits is 129024, while the sum is 43.

The square root of 28147849 is about 5305.4546459281. The cubic root of 28147849 is about 304.1924314031.

The spelling of 28147849 in words is "twenty-eight million, one hundred forty-seven thousand, eight hundred forty-nine".