78814781504 has 28 divisors (see below), whose sum is σ = 160212674748. Its totient is φ = 38446233600.

The previous prime is 78814781341. The next prime is 78814781509. The reversal of 78814781504 is 40518741887.

It can be written as a sum of positive squares in 2 ways, for example, as 25969967104 + 52844814400 = 161152^2 + 229880^2 .

It is not an unprimeable number, because it can be changed into a prime (78814781509) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 15015437 + ... + 15020684.

It is an arithmetic number, because the mean of its divisors is an integer number (5721881241).

Almost surely, 2^78814781504 is an apocalyptic number.

It is an amenable number.

78814781504 is an abundant number, since it is smaller than the sum of its proper divisors (81397893244).

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

78814781504 is a wasteful number, since it uses less digits than its factorization.

78814781504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30036174 (or 30036164 counting only the distinct ones).

The product of its (nonzero) digits is 2007040, while the sum is 53.

The spelling of 78814781504 in words is "seventy-eight billion, eight hundred fourteen million, seven hundred eighty-one thousand, five hundred four".