29000000000 has 200 divisors, whose sum is σ = 74926750140. Its totient is φ = 11200000000.

The previous prime is 28999999999. The next prime is 29000000009. The reversal of 29000000000 is 92.

It can be written as a sum of positive squares in 10 ways, for example, as 19035169024 + 9964830976 = 137968^2 + 99824^2 .

It is a sliding number, since 29000000000 = 4000000000 + 25000000000 and 1/4000000000 + 1/25000000000 = 0.00000000029000000000.

It is a tau number, because it is divible by the number of its divisors (200).

It is not an unprimeable number, because it can be changed into a prime (29000000009) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 999999986 + ... + 1000000014.

Almost surely, 2^29000000000 is an apocalyptic number.

29000000000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 29000000000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37463375070).

29000000000 is an abundant number, since it is smaller than the sum of its proper divisors (45926750140).

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

29000000000 is an frugal number, since it uses more digits than its factorization.

29000000000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92 (or 36 counting only the distinct ones).

The product of its (nonzero) digits is 18, while the sum is 11.

Subtracting from 29000000000 its product of nonzero digits (18), we obtain a palindrome (28999999982).

Adding to 29000000000 its reverse (92), we get a palindrome (29000000092).

The spelling of 29000000000 in words is "twenty-nine billion", and thus it is an aban number and an uban number.