67778584468408 has 96 divisors (see below), whose sum is σ = 141618193073280. Its totient is φ = 30385693166400.

The previous prime is 67778584468379. The next prime is 67778584468421. The reversal of 67778584468408 is 80486448587776.

It is a super-2 number, since 2×67778584468408² (a number of 28 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 23 ways as a sum of consecutive naturals, for example, 19030141 + ... + 22309267.

It is an arithmetic number, because the mean of its divisors is an integer number (1475189511180).

Almost surely, 2^{67778584468408} 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 67778584468408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (70809096536640).

67778584468408 is an abundant number, since it is smaller than the sum of its proper divisors (73839608604872).

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

67778584468408 is a wasteful number, since it uses less digits than its factorization.

67778584468408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3279449 (or 3279434 counting only the distinct ones).

The product of its (nonzero) digits is 16184770560, while the sum is 82.

The spelling of 67778584468408 in words is "sixty-seven trillion, seven hundred seventy-eight billion, five hundred eighty-four million, four hundred sixty-eight thousand, four hundred eight".