28722371 has 2 divisors, whose sum is σ = 28722372. Its totient is φ = 28722370.

The previous prime is 28722359. The next prime is 28722373. The reversal of 28722371 is 17322782.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28722371 - 2⁶ = 28722307 is a prime.

Together with 28722373, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28722373) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14361185 + 14361186.

It is an arithmetic number, because the mean of its divisors is an integer number (14361186).

Almost surely, 2^28722371 is an apocalyptic number.

28722371 is a deficient number, since it is larger than the sum of its proper divisors (1).

28722371 is an equidigital number, since it uses as much as digits as its factorization.

28722371 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9408, while the sum is 32.

The square root of 28722371 is about 5359.3256105596. The cubic root of 28722371 is about 306.2481184946.

The spelling of 28722371 in words is "twenty-eight million, seven hundred twenty-two thousand, three hundred seventy-one".