99990505 has 16 divisors (see below), whose sum is σ = 121726800. Its totient is φ = 78841600.

The previous prime is 99990493. The next prime is 99990511. The reversal of 99990505 is 50509999.

It can be written as a sum of positive squares in 8 ways, for example, as 6230016 + 93760489 = 2496^2 + 9683^2 .

It is not a de Polignac number, because 99990505 - 2¹⁷ = 99859433 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 15 ways as a sum of consecutive naturals, for example, 196191 + ... + 196699.

It is an arithmetic number, because the mean of its divisors is an integer number (7607925).

Almost surely, 2^99990505 is an apocalyptic number.

It is an amenable number.

99990505 is a deficient number, since it is larger than the sum of its proper divisors (21736295).

99990505 is a wasteful number, since it uses less digits than its factorization.

99990505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1004.

The product of its (nonzero) digits is 164025, while the sum is 46.

The square root of 99990505 is about 9999.5252387301. The cubic root of 99990505 is about 464.1441922676.

The spelling of 99990505 in words is "ninety-nine million, nine hundred ninety thousand, five hundred five".