29728200731 has 6 divisors (see below), whose sum is σ = 30233415420. Its totient is φ = 29223030996.

The previous prime is 29728200707. The next prime is 29728200739. The reversal of 29728200731 is 13700282792.

It is a de Polignac number, because none of the positive numbers 2^k-29728200731 is a prime.

It is a super-2 number, since 2×29728200731² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (29728200739) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1313150 + ... + 1335596.

It is an arithmetic number, because the mean of its divisors is an integer number (5038902570).

Almost surely, 2^29728200731 is an apocalyptic number.

29728200731 is a deficient number, since it is larger than the sum of its proper divisors (505214689).

29728200731 is an frugal number, since it uses more digits than its factorization.

29728200731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44953 (or 22506 counting only the distinct ones).

The product of its (nonzero) digits is 84672, while the sum is 41.

The spelling of 29728200731 in words is "twenty-nine billion, seven hundred twenty-eight million, two hundred thousand, seven hundred thirty-one".