28993637 has 2 divisors, whose sum is σ = 28993638. Its totient is φ = 28993636.

The previous prime is 28993621. The next prime is 28993693. The reversal of 28993637 is 73639982.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27050401 + 1943236 = 5201^2 + 1394^2 .

It is a cyclic number.

It is not a de Polignac number, because 28993637 - 2⁴ = 28993621 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28993591 and 28993600.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28993697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14496818 + 14496819.

It is an arithmetic number, because the mean of its divisors is an integer number (14496819).

Almost surely, 2^28993637 is an apocalyptic number.

It is an amenable number.

28993637 is a deficient number, since it is larger than the sum of its proper divisors (1).

28993637 is an equidigital number, since it uses as much as digits as its factorization.

28993637 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 28993637 is about 5384.5739850057. The cubic root of 28993637 is about 307.2092106353.

The spelling of 28993637 in words is "twenty-eight million, nine hundred ninety-three thousand, six hundred thirty-seven".