78478787772 has 72 divisors (see below), whose sum is σ = 247327097472. Its totient is φ = 20384100000.

The previous prime is 78478787771. The next prime is 78478787773. The reversal of 78478787772 is 27778787487.

78478787772 is a `hidden beast` number, since 7 + 8 + 478 + 7 + 87 + 7 + 72 = 666.

It is an interprime number because it is at equal distance from previous prime (78478787771) and next prime (78478787773).

It is a self number, because there is not a number n which added to its sum of digits gives 78478787772.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78478787771) 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 23 ways as a sum of consecutive naturals, for example, 14152854 + ... + 14158397.

It is an arithmetic number, because the mean of its divisors is an integer number (3435098576).

Almost surely, 2^78478787772 is an apocalyptic number.

It is an amenable number.

78478787772 is an abundant number, since it is smaller than the sum of its proper divisors (168848309700).

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

78478787772 is a wasteful number, since it uses less digits than its factorization.

78478787772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28311279 (or 28311274 counting only the distinct ones).

The product of its digits is 481890304, while the sum is 72.

The spelling of 78478787772 in words is "seventy-eight billion, four hundred seventy-eight million, seven hundred eighty-seven thousand, seven hundred seventy-two".