78125000000 has 98 divisors (see below), whose sum is σ = 193786621062. Its totient is φ = 31250000000.

The previous prime is 78124999969. The next prime is 78125000011. The reversal of 78125000000 is 52187.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in 7 ways, for example, as 73124813056 + 5000186944 = 270416^2 + 70712^2 .

It is a super-2 number, since 2×78125000000² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78125000000.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 15624999998 + ... + 15625000002.

Almost surely, 2^78125000000 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 78125000000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (96893310531).

78125000000 is an abundant number, since it is smaller than the sum of its proper divisors (115661621062).

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

78125000000 is an frugal number, since it uses more digits than its factorization.

78125000000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77 (or 7 counting only the distinct ones).

The product of its (nonzero) digits is 560, while the sum is 23.

Adding to 78125000000 its reverse (52187), we get a palindrome (78125052187).

The spelling of 78125000000 in words is "seventy-eight billion, one hundred twenty-five million", and thus it is an aban number.