28939637 has 2 divisors, whose sum is σ = 28939638. Its totient is φ = 28939636.

The previous prime is 28939633. The next prime is 28939697. The reversal of 28939637 is 73693982.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16273156 + 12666481 = 4034^2 + 3559^2 .

It is a cyclic number.

It is not a de Polignac number, because 28939637 - 2² = 28939633 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28939591 and 28939600.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28939633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14469818 + 14469819.

It is an arithmetic number, because the mean of its divisors is an integer number (14469819).

Almost surely, 2^28939637 is an apocalyptic number.

It is an amenable number.

28939637 is a deficient number, since it is larger than the sum of its proper divisors (1).

28939637 is an equidigital number, since it uses as much as digits as its factorization.

28939637 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 489888, while the sum is 47.

The square root of 28939637 is about 5379.5573237953. The cubic root of 28939637 is about 307.0183686803.

The spelling of 28939637 in words is "twenty-eight million, nine hundred thirty-nine thousand, six hundred thirty-seven".