78186769720 has 32 divisors (see below), whose sum is σ = 178330104720. Its totient is φ = 30846286080.

The previous prime is 78186769697. The next prime is 78186769723. The reversal of 78186769720 is 2796768187.

It is a super-2 number, since 2×78186769720² (a number of 23 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (61) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78186769723) 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 7 ways as a sum of consecutive naturals, for example, 13385226 + ... + 13391065.

Almost surely, 2^78186769720 is an apocalyptic number.

It is an amenable number.

78186769720 is an abundant number, since it is smaller than the sum of its proper divisors (100143335000).

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

78186769720 is a wasteful number, since it uses less digits than its factorization.

78186769720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26776375 (or 26776371 counting only the distinct ones).

The product of its (nonzero) digits is 14224896, while the sum is 61.

The spelling of 78186769720 in words is "seventy-eight billion, one hundred eighty-six million, seven hundred sixty-nine thousand, seven hundred twenty".