78399375000 has 128 divisors (see below), whose sum is σ = 245003279040. Its totient is φ = 20906000000.

The previous prime is 78399374969. The next prime is 78399375001. The reversal of 78399375000 is 57399387.

It is a happy number.

It is a super-2 number, since 2×78399375000² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78399375001) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1854094 + ... + 1895906.

Almost surely, 2^78399375000 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 78399375000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (122501639520).

78399375000 is an abundant number, since it is smaller than the sum of its proper divisors (166603904040).

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

78399375000 is an frugal number, since it uses more digits than its factorization.

78399375000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41857 (or 41823 counting only the distinct ones).

The product of its (nonzero) digits is 1428840, while the sum is 51.

It can be divided in two parts, 7839 and 9375000, that added together give a palindrome (9382839).

The spelling of 78399375000 in words is "seventy-eight billion, three hundred ninety-nine million, three hundred seventy-five thousand".