28918129 has 2 divisors, whose sum is σ = 28918130. Its totient is φ = 28918128.

The previous prime is 28918121. The next prime is 28918159. The reversal of 28918129 is 92181982.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27279729 + 1638400 = 5223^2 + 1280^2 .

It is a cyclic number.

It is not a de Polignac number, because 28918129 - 2³ = 28918121 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28918091 and 28918100.

It is not a weakly prime, because it can be changed into another prime (28918121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14459064 + 14459065.

It is an arithmetic number, because the mean of its divisors is an integer number (14459065).

Almost surely, 2^28918129 is an apocalyptic number.

It is an amenable number.

28918129 is a deficient number, since it is larger than the sum of its proper divisors (1).

28918129 is an equidigital number, since it uses as much as digits as its factorization.

28918129 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20736, while the sum is 40.

The square root of 28918129 is about 5377.5579029891. The cubic root of 28918129 is about 306.9422909278.

The spelling of 28918129 in words is "twenty-eight million, nine hundred eighteen thousand, one hundred twenty-nine".