129748756 has 12 divisors (see below), whose sum is σ = 227360980. Its totient is φ = 64788480.

The previous prime is 129748721. The next prime is 129748757. The reversal of 129748756 is 657847921.

It can be written as a sum of positive squares in 2 ways, for example, as 23328900 + 106419856 = 4830^2 + 10316^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129748757) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18015 + ... + 24166.

Almost surely, 2^129748756 is an apocalyptic number.

It is an amenable number.

129748756 is a deficient number, since it is larger than the sum of its proper divisors (97612224).

129748756 is a wasteful number, since it uses less digits than its factorization.

129748756 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42954 (or 42952 counting only the distinct ones).

The product of its digits is 846720, while the sum is 49.

The square root of 129748756 is about 11390.7311442242. The cubic root of 129748756 is about 506.2531450092.

The spelling of 129748756 in words is "one hundred twenty-nine million, seven hundred forty-eight thousand, seven hundred fifty-six".