28478113 has 2 divisors, whose sum is σ = 28478114. Its totient is φ = 28478112.

The previous prime is 28478101. The next prime is 28478129. The reversal of 28478113 is 31187482.

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., 28058209 + 419904 = 5297^2 + 648^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28478113 is a prime.

It is a super-2 number, since 2×28478113² = 1622005840081538, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28478143) 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, 14239056 + 14239057.

It is an arithmetic number, because the mean of its divisors is an integer number (14239057).

Almost surely, 2^28478113 is an apocalyptic number.

It is an amenable number.

28478113 is a deficient number, since it is larger than the sum of its proper divisors (1).

28478113 is an equidigital number, since it uses as much as digits as its factorization.

28478113 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10752, while the sum is 34.

The square root of 28478113 is about 5336.4888269348. The cubic root of 28478113 is about 305.3775240933.

The spelling of 28478113 in words is "twenty-eight million, four hundred seventy-eight thousand, one hundred thirteen".