78929531136 has 135 divisors (see below), whose sum is σ = 235474274343. Its totient is φ = 26296358400.

The previous prime is 78929531129. The next prime is 78929531137. The reversal of 78929531136 is 63113592987.

The square root of 78929531136 is 280944.

It is a perfect power (a square), and thus also a powerful number.

78929531136 is a `hidden beast` number, since 7 + 8 + 9 + 295 + 311 + 36 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (78929531137) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 40454961 + ... + 40456911.

Almost surely, 2^78929531136 is an apocalyptic number.

78929531136 is the 280944-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78929531136

78929531136 is an abundant number, since it is smaller than the sum of its proper divisors (156544743207).

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

78929531136 is an frugal number, since it uses more digits than its factorization.

78929531136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3930 (or 1956 counting only the distinct ones).

The product of its digits is 2449440, while the sum is 54.

The spelling of 78929531136 in words is "seventy-eight billion, nine hundred twenty-nine million, five hundred thirty-one thousand, one hundred thirty-six".