909640505 has 12 divisors (see below), whose sum is σ = 1159557420. Its totient is φ = 684904704.

The previous prime is 909640493. The next prime is 909640519. The reversal of 909640505 is 505046909.

It can be written as a sum of positive squares in 6 ways, for example, as 77721856 + 831918649 = 8816^2 + 28843^2 .

It is a de Polignac number, because none of the positive numbers 2^k-909640505 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 313310 + ... + 316199.

It is an arithmetic number, because the mean of its divisors is an integer number (96629785).

Almost surely, 2^909640505 is an apocalyptic number.

It is an amenable number.

909640505 is a deficient number, since it is larger than the sum of its proper divisors (249916915).

909640505 is a wasteful number, since it uses less digits than its factorization.

909640505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 629548 (or 629531 counting only the distinct ones).

The product of its (nonzero) digits is 48600, while the sum is 38.

The square root of 909640505 is about 30160.2470977941. The cubic root of 909640505 is about 968.9244837015.

The spelling of 909640505 in words is "nine hundred nine million, six hundred forty thousand, five hundred five".