28478873 has 2 divisors, whose sum is σ = 28478874. Its totient is φ = 28478872.

The previous prime is 28478839. The next prime is 28478897. The reversal of 28478873 is 37887482.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25928464 + 2550409 = 5092^2 + 1597^2 .

It is a cyclic number.

It is not a de Polignac number, because 28478873 - 2⁶ = 28478809 is a prime.

It is a super-2 number, since 2×28478873² = 1622092414700258, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28478803) 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, 14239436 + 14239437.

It is an arithmetic number, because the mean of its divisors is an integer number (14239437).

Almost surely, 2^28478873 is an apocalyptic number.

It is an amenable number.

28478873 is a deficient number, since it is larger than the sum of its proper divisors (1).

28478873 is an equidigital number, since it uses as much as digits as its factorization.

28478873 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 602112, while the sum is 47.

The square root of 28478873 is about 5336.5600343292. The cubic root of 28478873 is about 305.3802406222.

The spelling of 28478873 in words is "twenty-eight million, four hundred seventy-eight thousand, eight hundred seventy-three".