29896830649 has 27 divisors (see below), whose sum is σ = 36969489837. Its totient is φ = 24101852544.

The previous prime is 29896830643. The next prime is 29896830659. The reversal of 29896830649 is 94603869892.

The square root of 29896830649 is 172907.

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

It can be written as a sum of positive squares in 4 ways, for example, as 19018340649 + 10878490000 = 137907^2 + 104300^2 .

It is not a de Polignac number, because 29896830649 - 2³ = 29896830641 is a prime.

It is a super-2 number, since 2×29896830649² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (29896830641) 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, 20575207 + ... + 20576659.

Almost surely, 2^29896830649 is an apocalyptic number.

29896830649 is the 172907-th square number.

29896830649 is the 86454-th centered octagonal number.

It is an amenable number.

29896830649 is a deficient number, since it is larger than the sum of its proper divisors (7072659188).

29896830649 is an frugal number, since it uses more digits than its factorization.

29896830649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2954 (or 1477 counting only the distinct ones).

The product of its (nonzero) digits is 40310784, while the sum is 64.

Multiplying 29896830649 by its sum of digits (64), we get a square (1913397161536 = 1383256²).

The spelling of 29896830649 in words is "twenty-nine billion, eight hundred ninety-six million, eight hundred thirty thousand, six hundred forty-nine".