125678528729 has 16 divisors (see below), whose sum is σ = 138876003840. Its totient is φ = 112994663040.

The previous prime is 125678528719. The next prime is 125678528753. The reversal of 125678528729 is 927825876521.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-125678528729 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (125678528719) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 129302 + ... + 517760.

It is an arithmetic number, because the mean of its divisors is an integer number (8679750240).

Almost surely, 2^125678528729 is an apocalyptic number.

It is an amenable number.

125678528729 is a deficient number, since it is larger than the sum of its proper divisors (13197475111).

125678528729 is a wasteful number, since it uses less digits than its factorization.

125678528729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 389120.

The product of its digits is 33868800, while the sum is 62.

The spelling of 125678528729 in words is "one hundred twenty-five billion, six hundred seventy-eight million, five hundred twenty-eight thousand, seven hundred twenty-nine".