29928327997 has 4 divisors (see below), whose sum is σ = 29974160700. Its totient is φ = 29882495296.

The previous prime is 29928327991. The next prime is 29928328007. The reversal of 29928327997 is 79972382992.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14589257796 + 15339070201 = 120786^2 + 123851^2 .

It is a cyclic number.

It is not a de Polignac number, because 29928327997 - 2³¹ = 27780844349 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (29928327991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22915372 + ... + 22916677.

It is an arithmetic number, because the mean of its divisors is an integer number (7493540175).

Almost surely, 2^29928327997 is an apocalyptic number.

It is an amenable number.

29928327997 is a deficient number, since it is larger than the sum of its proper divisors (45832703).

29928327997 is an equidigital number, since it uses as much as digits as its factorization.

29928327997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45832702.

The product of its digits is 61725888, while the sum is 67.

The spelling of 29928327997 in words is "twenty-nine billion, nine hundred twenty-eight million, three hundred twenty-seven thousand, nine hundred ninety-seven".