84861984780 has 144 divisors (see below), whose sum is σ = 266213735424. Its totient is φ = 21859044480.

The previous prime is 84861984763. The next prime is 84861984829. The reversal of 84861984780 is 8748916848.

84861984780 is a `hidden beast` number, since 8 + 4 + 8 + 619 + 8 + 4 + 7 + 8 + 0 = 666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3038359 + ... + 3066161.

It is an arithmetic number, because the mean of its divisors is an integer number (1848706496).

Almost surely, 2^84861984780 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 84861984780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (133106867712).

84861984780 is an abundant number, since it is smaller than the sum of its proper divisors (181351750644).

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

84861984780 is a wasteful number, since it uses less digits than its factorization.

84861984780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28396 (or 28391 counting only the distinct ones).

The product of its (nonzero) digits is 24772608, while the sum is 63.

The spelling of 84861984780 in words is "eighty-four billion, eight hundred sixty-one million, nine hundred eighty-four thousand, seven hundred eighty".