29890393905 has 64 divisors (see below), whose sum is σ = 52418838528. Its totient is φ = 14478842880.

The previous prime is 29890393901. The next prime is 29890393957. The reversal of 29890393905 is 50939309892.

It is not a de Polignac number, because 29890393905 - 2² = 29890393901 is a prime.

It is a super-2 number, since 2×29890393905² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (29890393901) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2895984 + ... + 2906286.

It is an arithmetic number, because the mean of its divisors is an integer number (819044352).

Almost surely, 2^29890393905 is an apocalyptic number.

It is an amenable number.

29890393905 is a deficient number, since it is larger than the sum of its proper divisors (22528444623).

29890393905 is a wasteful number, since it uses less digits than its factorization.

29890393905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10726.

The product of its (nonzero) digits is 4723920, while the sum is 57.

The spelling of 29890393905 in words is "twenty-nine billion, eight hundred ninety million, three hundred ninety-three thousand, nine hundred five".