78378158684736 has 63 divisors (see below), whose sum is σ = 224657449281993. Its totient is φ = 26125982069760.

The previous prime is 78378158684713. The next prime is 78378158684797. The reversal of 78378158684736 is 63748685187387.

The square root of 78378158684736 is 8853144.

It is a perfect power (a square), and thus also a powerful number.

78378158684736 is a `hidden beast` number, since 7 + 8 + 3 + 7 + 81 + 5 + 8 + 68 + 473 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 62605187574336 + 15772971110400 = 7912344^2 + 3971520^2 .

It is a super-2 number, since 2×78378158684736² (a number of 29 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 212291016 + ... + 212659896.

Almost surely, 2^{78378158684736} is an apocalyptic number.

78378158684736 is the 8853144-th square number.

It is an amenable number.

78378158684736 is an abundant number, since it is smaller than the sum of its proper divisors (146279290597257).

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

78378158684736 is an frugal number, since it uses more digits than its factorization.

78378158684736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 737780 (or 368886 counting only the distinct ones).

The product of its digits is 9103933440, while the sum is 81.

The spelling of 78378158684736 in words is "seventy-eight trillion, three hundred seventy-eight billion, one hundred fifty-eight million, six hundred eighty-four thousand, seven hundred thirty-six".