84000844787 has 2 divisors, whose sum is σ = 84000844788. Its totient is φ = 84000844786.

The previous prime is 84000844783. The next prime is 84000844819. The reversal of 84000844787 is 78744800048.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 84000844787 - 2² = 84000844783 is a prime.

It is a super-2 number, since 2×84000844787² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (84000844783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42000422393 + 42000422394.

It is an arithmetic number, because the mean of its divisors is an integer number (42000422394).

Almost surely, 2^84000844787 is an apocalyptic number.

84000844787 is a deficient number, since it is larger than the sum of its proper divisors (1).

84000844787 is an equidigital number, since it uses as much as digits as its factorization.

84000844787 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1605632, while the sum is 50.

The spelling of 84000844787 in words is "eighty-four billion, eight hundred forty-four thousand, seven hundred eighty-seven".