28618873 has 2 divisors, whose sum is σ = 28618874. Its totient is φ = 28618872.

The previous prime is 28618841. The next prime is 28618901. The reversal of 28618873 is 37881682.

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., 22024249 + 6594624 = 4693^2 + 2568^2 .

It is a cyclic number.

It is not a de Polignac number, because 28618873 - 2⁵ = 28618841 is a prime.

It is a super-3 number, since 3×28618873³ (a number of 23 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (28618823) 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, 14309436 + 14309437.

It is an arithmetic number, because the mean of its divisors is an integer number (14309437).

Almost surely, 2^28618873 is an apocalyptic number.

It is an amenable number.

28618873 is a deficient number, since it is larger than the sum of its proper divisors (1).

28618873 is an equidigital number, since it uses as much as digits as its factorization.

28618873 is an odious number, because the sum of its binary digits is odd.

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

The square root of 28618873 is about 5349.6610172982. The cubic root of 28618873 is about 305.8798316367.

The spelling of 28618873 in words is "twenty-eight million, six hundred eighteen thousand, eight hundred seventy-three".