78923821320 has 192 divisors, whose sum is σ = 273908044800. Its totient is φ = 19665031680.

The previous prime is 78923821313. The next prime is 78923821321. The reversal of 78923821320 is 2312832987.

78923821320 is a `hidden beast` number, since 78 + 9 + 238 + 21 + 320 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (78923821321) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 201709 + ... + 445571.

It is an arithmetic number, because the mean of its divisors is an integer number (1426604400).

Almost surely, 2^78923821320 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 78923821320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (136954022400).

78923821320 is an abundant number, since it is smaller than the sum of its proper divisors (194984223480).

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

78923821320 is a wasteful number, since it uses less digits than its factorization.

78923821320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243940 (or 243933 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 45.

The spelling of 78923821320 in words is "seventy-eight billion, nine hundred twenty-three million, eight hundred twenty-one thousand, three hundred twenty".