28311947 has 2 divisors, whose sum is σ = 28311948. Its totient is φ = 28311946.

The previous prime is 28311901. The next prime is 28311971. The reversal of 28311947 is 74911382.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28311947 - 2⁶ = 28311883 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28314947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14155973 + 14155974.

It is an arithmetic number, because the mean of its divisors is an integer number (14155974).

Almost surely, 2^28311947 is an apocalyptic number.

28311947 is a deficient number, since it is larger than the sum of its proper divisors (1).

28311947 is an equidigital number, since it uses as much as digits as its factorization.

28311947 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12096, while the sum is 35.

The square root of 28311947 is about 5320.8971987814. The cubic root of 28311947 is about 304.7824193962.

The spelling of 28311947 in words is "twenty-eight million, three hundred eleven thousand, nine hundred forty-seven".