78647331840 has 704 divisors, whose sum is σ = 324574940160. Its totient is φ = 15771893760.

The previous prime is 78647331839. The next prime is 78647331857. The reversal of 78647331840 is 4813374687.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (704).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 34297734 + ... + 34300026.

Almost surely, 2^78647331840 is an apocalyptic number.

78647331840 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78647331840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (162287470080).

78647331840 is an abundant number, since it is smaller than the sum of its proper divisors (245927608320).

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

78647331840 is a wasteful number, since it uses less digits than its factorization.

78647331840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2368 (or 2350 counting only the distinct ones).

The product of its (nonzero) digits is 2709504, while the sum is 51.

The spelling of 78647331840 in words is "seventy-eight billion, six hundred forty-seven million, three hundred thirty-one thousand, eight hundred forty".