78471731529 has 20 divisors (see below), whose sum is σ = 117364707460. Its totient is φ = 52251337440.

The previous prime is 78471731501. The next prime is 78471731573. The reversal of 78471731529 is 92513717487.

78471731529 is a `hidden beast` number, since 7 + 8 + 47 + 1 + 73 + 1 + 529 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 62983431225 + 15488300304 = 250965^2 + 124452^2 .

It is not a de Polignac number, because 78471731529 - 2⁹ = 78471731017 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78471731329) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 517162 + ... + 651459.

It is an arithmetic number, because the mean of its divisors is an integer number (5868235373).

Almost surely, 2^78471731529 is an apocalyptic number.

It is an amenable number.

78471731529 is a deficient number, since it is larger than the sum of its proper divisors (38892975931).

78471731529 is a wasteful number, since it uses less digits than its factorization.

78471731529 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1169462 (or 1169453 counting only the distinct ones).

The product of its digits is 2963520, while the sum is 54.

It can be divided in two parts, 78471 and 731529, that added together give a 4-th power (810000 = 30⁴).

The spelling of 78471731529 in words is "seventy-eight billion, four hundred seventy-one million, seven hundred thirty-one thousand, five hundred twenty-nine".