78157000000 has 98 divisors (see below), whose sum is σ = 193865995046. Its totient is φ = 31262400000.

The previous prime is 78156999967. The next prime is 78157000003. The reversal of 78157000000 is 75187.

It is a happy number.

It can be written as a sum of positive squares in 7 ways, for example, as 67259310336 + 10897689664 = 259344^2 + 104392^2 .

It is a super-2 number, since 2×78157000000² (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 (78157000003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 960922 + ... + 1039078.

Almost surely, 2^78157000000 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 78157000000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (96932997523).

78157000000 is an abundant number, since it is smaller than the sum of its proper divisors (115708995046).

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

78157000000 is an frugal number, since it uses more digits than its factorization.

78157000000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78199 (or 78164 counting only the distinct ones).

The product of its (nonzero) digits is 1960, while the sum is 28.

Adding to 78157000000 its reverse (75187), we get a palindrome (78157075187).

The spelling of 78157000000 in words is "seventy-eight billion, one hundred fifty-seven million", and thus it is an aban number.