78470847777 has 24 divisors (see below), whose sum is σ = 121720536000. Its totient is φ = 44836561056.

The previous prime is 78470847733. The next prime is 78470847779. The reversal of 78470847777 is 77774807487.

It is not a de Polignac number, because 78470847777 - 2¹⁴ = 78470831393 is a prime.

It is a super-2 number, since 2×78470847777² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78470847779) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2919124 + ... + 2945882.

It is an arithmetic number, because the mean of its divisors is an integer number (5071689000).

Almost surely, 2^78470847777 is an apocalyptic number.

It is an amenable number.

78470847777 is a deficient number, since it is larger than the sum of its proper divisors (43249688223).

78470847777 is a wasteful number, since it uses less digits than its factorization.

78470847777 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46725 (or 46718 counting only the distinct ones).

The product of its (nonzero) digits is 120472576, while the sum is 66.

The spelling of 78470847777 in words is "seventy-eight billion, four hundred seventy million, eight hundred forty-seven thousand, seven hundred seventy-seven".