84428567 has 2 divisors, whose sum is σ = 84428568. Its totient is φ = 84428566.

The previous prime is 84428563. The next prime is 84428569. The reversal of 84428567 is 76582448.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 84428567 - 2² = 84428563 is a prime.

Together with 84428569, 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 (84428563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42214283 + 42214284.

It is an arithmetic number, because the mean of its divisors is an integer number (42214284).

Almost surely, 2^84428567 is an apocalyptic number.

84428567 is a deficient number, since it is larger than the sum of its proper divisors (1).

84428567 is an equidigital number, since it uses as much as digits as its factorization.

84428567 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 430080, while the sum is 44.

The square root of 84428567 is about 9188.5018909505. The cubic root of 84428567 is about 438.6954593827.

The spelling of 84428567 in words is "eighty-four million, four hundred twenty-eight thousand, five hundred sixty-seven".