78115575828 has 24 divisors (see below), whose sum is σ = 184465699488. Its totient is φ = 25724807776.

The previous prime is 78115575787. The next prime is 78115575833. The reversal of 78115575828 is 82857551187.

It is a super-2 number, since 2×78115575828² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39213651 + ... + 39215642.

It is an arithmetic number, because the mean of its divisors is an integer number (7686070812).

Almost surely, 2^78115575828 is an apocalyptic number.

It is an amenable number.

78115575828 is an abundant number, since it is smaller than the sum of its proper divisors (106350123660).

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

78115575828 is a wasteful number, since it uses less digits than its factorization.

78115575828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78429383 (or 78429381 counting only the distinct ones).

The product of its digits is 6272000, while the sum is 57.

The spelling of 78115575828 in words is "seventy-eight billion, one hundred fifteen million, five hundred seventy-five thousand, eight hundred twenty-eight".