28969873 has 2 divisors, whose sum is σ = 28969874. Its totient is φ = 28969872.

The previous prime is 28969867. The next prime is 28969877. The reversal of 28969873 is 37896982.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28815424 + 154449 = 5368^2 + 393^2 .

It is a cyclic number.

It is not a de Polignac number, because 28969873 - 2⁹ = 28969361 is a prime.

It is a super-2 number, since 2×28969873² = 1678507083272258, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 28969873.

It is not a weakly prime, because it can be changed into another prime (28969877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14484936 + 14484937.

It is an arithmetic number, because the mean of its divisors is an integer number (14484937).

Almost surely, 2^28969873 is an apocalyptic number.

It is an amenable number.

28969873 is a deficient number, since it is larger than the sum of its proper divisors (1).

28969873 is an equidigital number, since it uses as much as digits as its factorization.

28969873 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1306368, while the sum is 52.

The square root of 28969873 is about 5382.3668585484. The cubic root of 28969873 is about 307.1252552585.

It can be divided in two parts, 2896 and 9873, that added together give a square (12769 = 113²).

The spelling of 28969873 in words is "twenty-eight million, nine hundred sixty-nine thousand, eight hundred seventy-three".