78378616278 has 96 divisors (see below), whose sum is σ = 177096471552. Its totient is φ = 25980393600.

The previous prime is 78378616219. The next prime is 78378616279. The reversal of 78378616278 is 87261687387.

78378616278 is a `hidden beast` number, since 7 + 8 + 3 + 7 + 8 + 616 + 2 + 7 + 8 = 666.

It is a super-2 number, since 2×78378616278² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78378616279) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 124213023 + ... + 124213653.

It is an arithmetic number, because the mean of its divisors is an integer number (1844754912).

Almost surely, 2^78378616278 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78378616278, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (88548235776).

78378616278 is an abundant number, since it is smaller than the sum of its proper divisors (98717855274).

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

78378616278 is a wasteful number, since it uses less digits than its factorization.

78378616278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1672 (or 1660 counting only the distinct ones).

The product of its digits is 37933056, while the sum is 63.

The spelling of 78378616278 in words is "seventy-eight billion, three hundred seventy-eight million, six hundred sixteen thousand, two hundred seventy-eight".