29898905569 has 27 divisors (see below), whose sum is σ = 33196540563. Its totient is φ = 26916329232.

The previous prime is 29898905563. The next prime is 29898905579. The reversal of 29898905569 is 96550989892.

The square root of 29898905569 is 172913.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 4422915025 + 25475990544 = 66505^2 + 159612^2 .

It is not a de Polignac number, because 29898905569 - 2¹³ = 29898897377 is a prime.

It is a super-2 number, since 2×29898905569² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 29898905498 and 29898905507.

It is not an unprimeable number, because it can be changed into a prime (29898905563) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 105649702 + ... + 105649984.

Almost surely, 2^29898905569 is an apocalyptic number.

29898905569 is the 172913-rd square number.

29898905569 is the 86457-th centered octagonal number.

It is an amenable number.

29898905569 is a deficient number, since it is larger than the sum of its proper divisors (3297634994).

29898905569 is an frugal number, since it uses more digits than its factorization.

29898905569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 686 (or 343 counting only the distinct ones).

The product of its (nonzero) digits is 125971200, while the sum is 70.

The spelling of 29898905569 in words is "twenty-nine billion, eight hundred ninety-eight million, nine hundred five thousand, five hundred sixty-nine".