78723467904 has 128 divisors (see below), whose sum is σ = 220253414400. Its totient is φ = 24844409856.

The previous prime is 78723467897. The next prime is 78723467939. The reversal of 78723467904 is 40976432787.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (57).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18551607 + ... + 18555849.

It is an arithmetic number, because the mean of its divisors is an integer number (1720729800).

Almost surely, 2^78723467904 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 78723467904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (110126707200).

78723467904 is an abundant number, since it is smaller than the sum of its proper divisors (141529946496).

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

78723467904 is a wasteful number, since it uses less digits than its factorization.

78723467904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6822 (or 6810 counting only the distinct ones).

The product of its (nonzero) digits is 14224896, while the sum is 57.

The spelling of 78723467904 in words is "seventy-eight billion, seven hundred twenty-three million, four hundred sixty-seven thousand, nine hundred four".