78115874420 has 12 divisors (see below), whose sum is σ = 164043336324. Its totient is φ = 31246349760.

The previous prime is 78115874401. The next prime is 78115874443. The reversal of 78115874420 is 2447851187.

It can be written as a sum of positive squares in 2 ways, for example, as 34407282064 + 43708592356 = 185492^2 + 209066^2 .

It is a super-2 number, since 2×78115874420² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1952896841 + ... + 1952896880.

It is an arithmetic number, because the mean of its divisors is an integer number (13670278027).

Almost surely, 2^78115874420 is an apocalyptic number.

It is an amenable number.

78115874420 is an abundant number, since it is smaller than the sum of its proper divisors (85927461904).

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

78115874420 is a wasteful number, since it uses less digits than its factorization.

78115874420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3905793730 (or 3905793728 counting only the distinct ones).

The product of its (nonzero) digits is 501760, while the sum is 47.

The spelling of 78115874420 in words is "seventy-eight billion, one hundred fifteen million, eight hundred seventy-four thousand, four hundred twenty".