28739297 has 6 divisors (see below), whose sum is σ = 29143782. Its totient is φ = 28340352.

The previous prime is 28739287. The next prime is 28739323. The reversal of 28739297 is 79293782.

It can be written as a sum of positive squares in 3 ways, for example, as 13184161 + 15555136 = 3631^2 + 3944^2 .

It is not a de Polignac number, because 28739297 - 2⁴ = 28739281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28739287) 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 in 5 ways as a sum of consecutive naturals, for example, 2633 + ... + 8025.

It is an arithmetic number, because the mean of its divisors is an integer number (4857297).

Almost surely, 2^28739297 is an apocalyptic number.

It is an amenable number.

28739297 is a deficient number, since it is larger than the sum of its proper divisors (404485).

28739297 is an frugal number, since it uses more digits than its factorization.

28739297 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5539 (or 5466 counting only the distinct ones).

The product of its digits is 381024, while the sum is 47.

The square root of 28739297 is about 5360.9044945792. The cubic root of 28739297 is about 306.3082636891.

The spelling of 28739297 in words is "twenty-eight million, seven hundred thirty-nine thousand, two hundred ninety-seven".