29908220738 has 18 divisors (see below), whose sum is σ = 49315923993. Its totient is φ = 13593422920.

The previous prime is 29908220653. The next prime is 29908220743. The reversal of 29908220738 is 83702280992.

It can be written as a sum of positive squares in 2 ways, for example, as 24285170569 + 5623050169 = 155837^2 + 74987^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=122287.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 2684756 + ... + 2695872.

Almost surely, 2^29908220738 is an apocalyptic number.

29908220738 is a deficient number, since it is larger than the sum of its proper divisors (19407703255).

29908220738 is an frugal number, since it uses more digits than its factorization.

29908220738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22258 (or 11130 counting only the distinct ones).

The product of its (nonzero) digits is 870912, while the sum is 50.

Multiplying 29908220738 by its sum of digits (50), we get a square (1495411036900 = 1222870²).

The spelling of 29908220738 in words is "twenty-nine billion, nine hundred eight million, two hundred twenty thousand, seven hundred thirty-eight".