29220728639 has 4 divisors (see below), whose sum is σ = 29590611360. Its totient is φ = 28850845920.

The previous prime is 29220728629. The next prime is 29220728683. The reversal of 29220728639 is 93682702292.

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

It is a cyclic number.

It is not a de Polignac number, because 29220728639 - 2¹² = 29220724543 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 (29220728629) 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, 184941242 + ... + 184941399.

It is an arithmetic number, because the mean of its divisors is an integer number (7397652840).

Almost surely, 2^29220728639 is an apocalyptic number.

29220728639 is a deficient number, since it is larger than the sum of its proper divisors (369882721).

29220728639 is an equidigital number, since it uses as much as digits as its factorization.

29220728639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 369882720.

The product of its (nonzero) digits is 1306368, while the sum is 50.

The spelling of 29220728639 in words is "twenty-nine billion, two hundred twenty million, seven hundred twenty-eight thousand, six hundred thirty-nine".