28944437 has 2 divisors, whose sum is σ = 28944438. Its totient is φ = 28944436.

The previous prime is 28944371. The next prime is 28944473. The reversal of 28944437 is 73444982.

Together with next prime (28944473) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16313521 + 12630916 = 4039^2 + 3554^2 .

It is a cyclic number.

It is not a de Polignac number, because 28944437 - 2²² = 24750133 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 28944394 and 28944403.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28944037) 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, 14472218 + 14472219.

It is an arithmetic number, because the mean of its divisors is an integer number (14472219).

Almost surely, 2^28944437 is an apocalyptic number.

It is an amenable number.

28944437 is a deficient number, since it is larger than the sum of its proper divisors (1).

28944437 is an equidigital number, since it uses as much as digits as its factorization.

28944437 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 193536, while the sum is 41.

The square root of 28944437 is about 5380.0034386606. The cubic root of 28944437 is about 307.0353420180.

The spelling of 28944437 in words is "twenty-eight million, nine hundred forty-four thousand, four hundred thirty-seven".