78280620166584 has 480 divisors, whose sum is σ = 243410513068800. Its totient is φ = 23485371465600.

The previous prime is 78280620166579. The next prime is 78280620166621. The reversal of 78280620166584 is 48566102608287.

78280620166584 is a `hidden beast` number, since 7 + 8 + 28 + 0 + 6 + 20 + 1 + 6 + 6 + 584 = 666.

It is a super-2 number, since 2×78280620166584² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 3999817519 + ... + 3999837089.

It is an arithmetic number, because the mean of its divisors is an integer number (507105235560).

Almost surely, 2^{78280620166584} 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 78280620166584, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (121705256534400).

78280620166584 is an abundant number, since it is smaller than the sum of its proper divisors (165129892902216).

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

78280620166584 is a wasteful number, since it uses less digits than its factorization.

78280620166584 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20117 (or 20093 counting only the distinct ones).

The product of its (nonzero) digits is 61931520, while the sum is 63.

The spelling of 78280620166584 in words is "seventy-eight trillion, two hundred eighty billion, six hundred twenty million, one hundred sixty-six thousand, five hundred eighty-four".