84071778 has 16 divisors (see below), whose sum is σ = 192164160. Its totient is φ = 24020496.

The previous prime is 84071761. The next prime is 84071797. The reversal of 84071778 is 87717048.

It is a Harshad number since it is a multiple of its sum of digits (42), and also a Moran number because the ratio is a prime number: 2001709 = 84071778 / (8 + 4 + 0 + 7 + 1 + 7 + 7 + 8).

It is a Curzon number.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 1000813 + ... + 1000896.

It is an arithmetic number, because the mean of its divisors is an integer number (12010260).

Almost surely, 2^84071778 is an apocalyptic number.

84071778 is an abundant number, since it is smaller than the sum of its proper divisors (108092382).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

84071778 is a wasteful number, since it uses less digits than its factorization.

84071778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2001721.

The product of its (nonzero) digits is 87808, while the sum is 42.

The square root of 84071778 is about 9169.0663646851. The cubic root of 84071778 is about 438.0766217781.

The spelling of 84071778 in words is "eighty-four million, seventy-one thousand, seven hundred seventy-eight".