28372247 has 2 divisors, whose sum is σ = 28372248. Its totient is φ = 28372246.

The previous prime is 28372243. The next prime is 28372249. The reversal of 28372247 is 74227382.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28372247 - 2² = 28372243 is a prime.

It is a super-3 number, since 3×28372247³ (a number of 23 digits) contains 333 as substring.

Together with 28372249, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28372243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14186123 + 14186124.

It is an arithmetic number, because the mean of its divisors is an integer number (14186124).

Almost surely, 2^28372247 is an apocalyptic number.

28372247 is a deficient number, since it is larger than the sum of its proper divisors (1).

28372247 is an equidigital number, since it uses as much as digits as its factorization.

28372247 is an evil number, because the sum of its binary digits is even.

The product of its digits is 37632, while the sum is 35.

The square root of 28372247 is about 5326.5605225136. The cubic root of 28372247 is about 304.9986455194.

The spelling of 28372247 in words is "twenty-eight million, three hundred seventy-two thousand, two hundred forty-seven".