28736297 has 4 divisors (see below), whose sum is σ = 28789956. Its totient is φ = 28682640.

The previous prime is 28736263. The next prime is 28736299. The reversal of 28736297 is 79263782.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 20693401 + 8042896 = 4549^2 + 2836^2 .

It is a cyclic number.

It is not a de Polignac number, because 28736297 - 2⁸ = 28736041 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28736299) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26018 + ... + 27099.

It is an arithmetic number, because the mean of its divisors is an integer number (7197489).

Almost surely, 2^28736297 is an apocalyptic number.

It is an amenable number.

28736297 is a deficient number, since it is larger than the sum of its proper divisors (53659).

28736297 is an equidigital number, since it uses as much as digits as its factorization.

28736297 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53658.

The product of its digits is 254016, while the sum is 44.

The square root of 28736297 is about 5360.6246837472. The cubic root of 28736297 is about 306.2976051499.

The spelling of 28736297 in words is "twenty-eight million, seven hundred thirty-six thousand, two hundred ninety-seven".