28715233 has 2 divisors, whose sum is σ = 28715234. Its totient is φ = 28715232.

The previous prime is 28715231. The next prime is 28715257. The reversal of 28715233 is 33251782.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27699169 + 1016064 = 5263^2 + 1008^2 .

It is a cyclic number.

It is not a de Polignac number, because 28715233 - 2¹ = 28715231 is a prime.

Together with 28715231, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 28715195 and 28715204.

It is not a weakly prime, because it can be changed into another prime (28715231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14357616 + 14357617.

It is an arithmetic number, because the mean of its divisors is an integer number (14357617).

Almost surely, 2^28715233 is an apocalyptic number.

It is an amenable number.

28715233 is a deficient number, since it is larger than the sum of its proper divisors (1).

28715233 is an equidigital number, since it uses as much as digits as its factorization.

28715233 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10080, while the sum is 31.

The square root of 28715233 is about 5358.6596271829. The cubic root of 28715233 is about 306.2227470959. Note that the first 3 decimals are identical.

The spelling of 28715233 in words is "twenty-eight million, seven hundred fifteen thousand, two hundred thirty-three".