78500129 has 8 divisors (see below), whose sum is σ = 82014120. Its totient is φ = 75040000.

The previous prime is 78500113. The next prime is 78500131. The reversal of 78500129 is 92100587.

It can be written as a sum of positive squares in 4 ways, for example, as 25603600 + 52896529 = 5060^2 + 7273^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 78500129 - 2⁴ = 78500113 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 78500095 and 78500104.

It is not an unprimeable number, because it can be changed into a prime (78500159) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10472 + ... + 16329.

It is an arithmetic number, because the mean of its divisors is an integer number (10251765).

Almost surely, 2^78500129 is an apocalyptic number.

It is an amenable number.

78500129 is a deficient number, since it is larger than the sum of its proper divisors (3513991).

78500129 is a wasteful number, since it uses less digits than its factorization.

78500129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26931.

The product of its (nonzero) digits is 5040, while the sum is 32.

The square root of 78500129 is about 8860.0298532228. The cubic root of 78500129 is about 428.1771201149.

The spelling of 78500129 in words is "seventy-eight million, five hundred thousand, one hundred twenty-nine".