28722047 has 2 divisors, whose sum is σ = 28722048. Its totient is φ = 28722046.

The previous prime is 28722019. The next prime is 28722059. The reversal of 28722047 is 74022782.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28722047 - 2⁶ = 28721983 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28722097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14361023 + 14361024.

It is an arithmetic number, because the mean of its divisors is an integer number (14361024).

Almost surely, 2^28722047 is an apocalyptic number.

28722047 is a deficient number, since it is larger than the sum of its proper divisors (1).

28722047 is an equidigital number, since it uses as much as digits as its factorization.

28722047 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12544, while the sum is 32.

The square root of 28722047 is about 5359.2953827905. The cubic root of 28722047 is about 306.2469669559.

The spelling of 28722047 in words is "twenty-eight million, seven hundred twenty-two thousand, forty-seven".