78329370778 has 16 divisors (see below), whose sum is σ = 126694491840. Its totient is φ = 36198424800.

The previous prime is 78329370761. The next prime is 78329370787. The reversal of 78329370778 is 87707392387.

It is a super-2 number, since 2×78329370778² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25136238 + ... + 25139353.

It is an arithmetic number, because the mean of its divisors is an integer number (7918405740).

Almost surely, 2^78329370778 is an apocalyptic number.

78329370778 is a deficient number, since it is larger than the sum of its proper divisors (48365121062).

78329370778 is a wasteful number, since it uses less digits than its factorization.

78329370778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50275653.

The product of its (nonzero) digits is 24893568, while the sum is 61.

The spelling of 78329370778 in words is "seventy-eight billion, three hundred twenty-nine million, three hundred seventy thousand, seven hundred seventy-eight".