78511468772 has 24 divisors (see below), whose sum is σ = 149901229632. Its totient is φ = 35683293600.

The previous prime is 78511468771. The next prime is 78511468879. The reversal of 78511468772 is 27786411587.

It is not an unprimeable number, because it can be changed into a prime (78511468771) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 355697 + ... + 532487.

It is an arithmetic number, because the mean of its divisors is an integer number (6245884568).

Almost surely, 2^78511468772 is an apocalyptic number.

It is an amenable number.

78511468772 is a deficient number, since it is larger than the sum of its proper divisors (71389760860).

78511468772 is a wasteful number, since it uses less digits than its factorization.

78511468772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186899 (or 186897 counting only the distinct ones).

The product of its digits is 5268480, while the sum is 56.

The spelling of 78511468772 in words is "seventy-eight billion, five hundred eleven million, four hundred sixty-eight thousand, seven hundred seventy-two".