28491347 has 2 divisors, whose sum is σ = 28491348. Its totient is φ = 28491346.

The previous prime is 28491343. The next prime is 28491361. The reversal of 28491347 is 74319482.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28491347 - 2² = 28491343 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28491347.

It is not a weakly prime, because it can be changed into another prime (28491341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14245673 + 14245674.

It is an arithmetic number, because the mean of its divisors is an integer number (14245674).

Almost surely, 2^28491347 is an apocalyptic number.

28491347 is a deficient number, since it is larger than the sum of its proper divisors (1).

28491347 is an equidigital number, since it uses as much as digits as its factorization.

28491347 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48384, while the sum is 38.

The square root of 28491347 is about 5337.7286367892. The cubic root of 28491347 is about 305.4248205357.

The spelling of 28491347 in words is "twenty-eight million, four hundred ninety-one thousand, three hundred forty-seven".