78688316340 has 72 divisors (see below), whose sum is σ = 238960536360. Its totient is φ = 20959582464.

The previous prime is 78688316281. The next prime is 78688316353. The reversal of 78688316340 is 4361388687.

It can be written as a sum of positive squares in 4 ways, for example, as 44357414544 + 34330901796 = 210612^2 + 185286^2 .

It is a super-2 number, since 2×78688316340² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 91375 + ... + 407094.

Almost surely, 2^78688316340 is an apocalyptic number.

It is an amenable number.

78688316340 is an abundant number, since it is smaller than the sum of its proper divisors (160272220020).

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

78688316340 is a wasteful number, since it uses less digits than its factorization.

78688316340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 499361 (or 499356 counting only the distinct ones).

The product of its (nonzero) digits is 4644864, while the sum is 54.

The spelling of 78688316340 in words is "seventy-eight billion, six hundred eighty-eight million, three hundred sixteen thousand, three hundred forty".