78751984640 has 264 divisors, whose sum is σ = 222287496480. Its totient is φ = 26689732608.

The previous prime is 78751984639. The next prime is 78751984651. The reversal of 78751984640 is 4648915787.

It is a self number, because there is not a number n which added to its sum of digits gives 78751984640.

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, 22326557 + ... + 22330083.

Almost surely, 2^78751984640 is an apocalyptic number.

78751984640 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 78751984640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (111143748240).

78751984640 is an abundant number, since it is smaller than the sum of its proper divisors (143535511840).

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

78751984640 is a wasteful number, since it uses less digits than its factorization.

78751984640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3655 (or 3630 counting only the distinct ones).

The product of its (nonzero) digits is 13547520, while the sum is 59.

The spelling of 78751984640 in words is "seventy-eight billion, seven hundred fifty-one million, nine hundred eighty-four thousand, six hundred forty".