78688638760 has 32 divisors (see below), whose sum is σ = 178874697960. Its totient is φ = 31150964736.

The previous prime is 78688638737. The next prime is 78688638761. The reversal of 78688638760 is 6783688687.

It can be written as a sum of positive squares in 4 ways, for example, as 73524491716 + 5164147044 = 271154^2 + 71862^2 .

It is a super-3 number, since 3×78688638760³ (a number of 34 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (78688638761) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10136409 + ... + 10144168.

Almost surely, 2^78688638760 is an apocalyptic number.

It is an amenable number.

78688638760 is an abundant number, since it is smaller than the sum of its proper divisors (100186059200).

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

78688638760 is a wasteful number, since it uses less digits than its factorization.

78688638760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20280685 (or 20280681 counting only the distinct ones).

The product of its (nonzero) digits is 130056192, while the sum is 67.

The spelling of 78688638760 in words is "seventy-eight billion, six hundred eighty-eight million, six hundred thirty-eight thousand, seven hundred sixty".