78443778670 has 32 divisors (see below), whose sum is σ = 148646599200. Its totient is φ = 29722807296.

The previous prime is 78443778583. The next prime is 78443778671. The reversal of 78443778670 is 7687734487.

It is a junction number, because it is equal to n+sod(n) for n = 78443778599 and 78443778608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78443778671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2394642 + ... + 2427178.

It is an arithmetic number, because the mean of its divisors is an integer number (4645206225).

Almost surely, 2^78443778670 is an apocalyptic number.

78443778670 is a deficient number, since it is larger than the sum of its proper divisors (70202820530).

78443778670 is a wasteful number, since it uses less digits than its factorization.

78443778670 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45252.

The product of its (nonzero) digits is 44255232, while the sum is 61.

The spelling of 78443778670 in words is "seventy-eight billion, four hundred forty-three million, seven hundred seventy-eight thousand, six hundred seventy".