78644947500 has 360 divisors, whose sum is σ = 284920796160. Its totient is φ = 17911728000.

The previous prime is 78644947483. The next prime is 78644947501. The reversal of 78644947500 is 574944687.

78644947500 is a `hidden beast` number, since 7 + 8 + 6 + 44 + 94 + 7 + 500 = 666.

It is not an unprimeable number, because it can be changed into a prime (78644947501) by changing a digit.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 54651781 + ... + 54653219.

It is an arithmetic number, because the mean of its divisors is an integer number (791446656).

Almost surely, 2^78644947500 is an apocalyptic number.

78644947500 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 78644947500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (142460398080).

78644947500 is an abundant number, since it is smaller than the sum of its proper divisors (206275848660).

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

78644947500 is a wasteful number, since it uses less digits than its factorization.

78644947500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1823 (or 1803 counting only the distinct ones).

The product of its (nonzero) digits is 6773760, while the sum is 54.

The spelling of 78644947500 in words is "seventy-eight billion, six hundred forty-four million, nine hundred forty-seven thousand, five hundred".