28918873 has 2 divisors, whose sum is σ = 28918874. Its totient is φ = 28918872.

The previous prime is 28918871. The next prime is 28918891. The reversal of 28918873 is 37881982.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27373824 + 1545049 = 5232^2 + 1243^2 .

It is a cyclic number.

It is not a de Polignac number, because 28918873 - 2¹ = 28918871 is a prime.

Together with 28918871, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (28918871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14459436 + 14459437.

It is an arithmetic number, because the mean of its divisors is an integer number (14459437).

Almost surely, 2^28918873 is an apocalyptic number.

It is an amenable number.

28918873 is a deficient number, since it is larger than the sum of its proper divisors (1).

28918873 is an equidigital number, since it uses as much as digits as its factorization.

28918873 is an evil number, because the sum of its binary digits is even.

The product of its digits is 193536, while the sum is 46.

The square root of 28918873 is about 5377.6270789262. The cubic root of 28918873 is about 306.9449232224.

It can be divided in two parts, 28918 and 873, that added together give a cube (29791 = 31³).

The spelling of 28918873 in words is "twenty-eight million, nine hundred eighteen thousand, eight hundred seventy-three".