28278337 has 2 divisors, whose sum is σ = 28278338. Its totient is φ = 28278336.

The previous prime is 28278331. The next prime is 28278347. The reversal of 28278337 is 73387282.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27888961 + 389376 = 5281^2 + 624^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28278337 is a prime.

It is a super-3 number, since 3×28278337³ (a number of 23 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 28278337.

It is not a weakly prime, because it can be changed into another prime (28278331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14139168 + 14139169.

It is an arithmetic number, because the mean of its divisors is an integer number (14139169).

Almost surely, 2^28278337 is an apocalyptic number.

It is an amenable number.

28278337 is a deficient number, since it is larger than the sum of its proper divisors (1).

28278337 is an equidigital number, since it uses as much as digits as its factorization.

28278337 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 112896, while the sum is 40.

The square root of 28278337 is about 5317.7379589446. The cubic root of 28278337 is about 304.6617660510.

The spelling of 28278337 in words is "twenty-eight million, two hundred seventy-eight thousand, three hundred thirty-seven".