29905821808 has 20 divisors (see below), whose sum is σ = 59355763488. Its totient is φ = 14588205440.

The previous prime is 29905821797. The next prime is 29905821811. The reversal of 29905821808 is 80812850992.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22793416 + ... + 22794727.

Almost surely, 2^29905821808 is an apocalyptic number.

It is an amenable number.

29905821808 is a deficient number, since it is larger than the sum of its proper divisors (29449941680).

29905821808 is a wasteful number, since it uses less digits than its factorization.

29905821808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45588192 (or 45588186 counting only the distinct ones).

The product of its (nonzero) digits is 829440, while the sum is 52.

The spelling of 29905821808 in words is "twenty-nine billion, nine hundred five million, eight hundred twenty-one thousand, eight hundred eight".