78669317880 has 256 divisors, whose sum is σ = 265764240000. Its totient is φ = 20696924160.

The previous prime is 78669317873. The next prime is 78669317887. The reversal of 78669317880 is 8871396687.

It is an interprime number because it is at equal distance from previous prime (78669317873) and next prime (78669317887).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78669317887) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 84681256 + ... + 84682184.

Almost surely, 2^78669317880 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78669317880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (132882120000).

78669317880 is an abundant number, since it is smaller than the sum of its proper divisors (187094922120).

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

78669317880 is a wasteful number, since it uses less digits than its factorization.

78669317880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1919 (or 1909 counting only the distinct ones).

The product of its (nonzero) digits is 24385536, while the sum is 63.

The spelling of 78669317880 in words is "seventy-eight billion, six hundred sixty-nine million, three hundred seventeen thousand, eight hundred eighty".