28981837 has 2 divisors, whose sum is σ = 28981838. Its totient is φ = 28981836.

The previous prime is 28981819. The next prime is 28981853. The reversal of 28981837 is 73818982.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17732521 + 11249316 = 4211^2 + 3354^2 .

It is a cyclic number.

It is not a de Polignac number, because 28981837 - 2⁷ = 28981709 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28981867) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14490918 + 14490919.

It is an arithmetic number, because the mean of its divisors is an integer number (14490919).

Almost surely, 2^28981837 is an apocalyptic number.

It is an amenable number.

28981837 is a deficient number, since it is larger than the sum of its proper divisors (1).

28981837 is an equidigital number, since it uses as much as digits as its factorization.

28981837 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 28981837 is about 5383.4781507869. The cubic root of 28981837 is about 307.1675283796.

The spelling of 28981837 in words is "twenty-eight million, nine hundred eighty-one thousand, eight hundred thirty-seven".