78329370777 has 32 divisors (see below), whose sum is σ = 122619494400. Its totient is φ = 43537652928.

The previous prime is 78329370761. The next prime is 78329370787. The reversal of 78329370777 is 77707392387.

It is not a de Polignac number, because 78329370777 - 2⁴ = 78329370761 is a prime.

It is a super-2 number, since 2×78329370777² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78329370777.

It is not an unprimeable number, because it can be changed into a prime (78329370787) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3219424 + ... + 3243662.

It is an arithmetic number, because the mean of its divisors is an integer number (3831859200).

Almost surely, 2^78329370777 is an apocalyptic number.

It is an amenable number.

78329370777 is a deficient number, since it is larger than the sum of its proper divisors (44290123623).

78329370777 is a wasteful number, since it uses less digits than its factorization.

78329370777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28445.

The product of its (nonzero) digits is 21781872, while the sum is 60.

The spelling of 78329370777 in words is "seventy-eight billion, three hundred twenty-nine million, three hundred seventy thousand, seven hundred seventy-seven".