9139729728 has 28 divisors (see below), whose sum is σ = 24182202080. Its totient is φ = 3046576512.

The previous prime is 9139729727. The next prime is 9139729747. The reversal of 9139729728 is 8279279319.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9139729727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23801188 + ... + 23801571.

Almost surely, 2^9139729728 is an apocalyptic number.

It is an amenable number.

9139729728 is an abundant number, since it is smaller than the sum of its proper divisors (15042472352).

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

9139729728 is a wasteful number, since it uses less digits than its factorization.

9139729728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47602774 (or 47602764 counting only the distinct ones).

The product of its digits is 3429216, while the sum is 57.

The square root of 9139729728 is about 95601.9337042928. The cubic root of 9139729728 is about 2090.7933869622.

The spelling of 9139729728 in words is "nine billion, one hundred thirty-nine million, seven hundred twenty-nine thousand, seven hundred twenty-eight".