78986985408 has 280 divisors, whose sum is σ = 244615594080. Its totient is φ = 25169356800.

The previous prime is 78986985377. The next prime is 78986985419. The reversal of 78986985408 is 80458968987.

78986985408 is a `hidden beast` number, since 7 + 89 + 8 + 69 + 85 + 408 = 666.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 15482058 + ... + 15487158.

Almost surely, 2^78986985408 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 78986985408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (122307797040).

78986985408 is an abundant number, since it is smaller than the sum of its proper divisors (165628608672).

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

78986985408 is a wasteful number, since it uses less digits than its factorization.

78986985408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5257 (or 5238 counting only the distinct ones).

The product of its (nonzero) digits is 278691840, while the sum is 72.

The spelling of 78986985408 in words is "seventy-eight billion, nine hundred eighty-six million, nine hundred eighty-five thousand, four hundred eight".