49999999905 has 48 divisors (see below), whose sum is σ = 91804184784. Its totient is φ = 25087242240.

The previous prime is 49999999867. The next prime is 49999999957. The reversal of 49999999905 is 50999999994.

It can be written as a sum of positive squares in 8 ways, for example, as 2238519969 + 47761479936 = 47313^2 + 218544^2 .

It is not a de Polignac number, because 49999999905 - 2¹¹ = 49999997857 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1943325 + ... + 1968885.

It is an arithmetic number, because the mean of its divisors is an integer number (1912587183).

Almost surely, 2^49999999905 is an apocalyptic number.

49999999905 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

49999999905 is a deficient number, since it is larger than the sum of its proper divisors (41804184879).

49999999905 is a wasteful number, since it uses less digits than its factorization.

49999999905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28146 (or 28143 counting only the distinct ones).

The product of its (nonzero) digits is 860934420, while the sum is 81.

The spelling of 49999999905 in words is "forty-nine billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred five".