84386709878 has 8 divisors (see below), whose sum is σ = 132083545968. Its totient is φ = 40358861224.

The previous prime is 84386709821. The next prime is 84386709919. The reversal of 84386709878 is 87890768348.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×84386709878² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 917246801 + ... + 917246892.

It is an arithmetic number, because the mean of its divisors is an integer number (16510443246).

Almost surely, 2^84386709878 is an apocalyptic number.

84386709878 is a deficient number, since it is larger than the sum of its proper divisors (47696836090).

84386709878 is a wasteful number, since it uses less digits than its factorization.

84386709878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1834493718.

The product of its (nonzero) digits is 130056192, while the sum is 68.

The spelling of 84386709878 in words is "eighty-four billion, three hundred eighty-six million, seven hundred nine thousand, eight hundred seventy-eight".