1999564506 has 48 divisors (see below), whose sum is σ = 4510914408. Its totient is φ = 639590400.

The previous prime is 1999564487. The next prime is 1999564519. The reversal of 1999564506 is 6054659991.

It can be written as a sum of positive squares in 4 ways, for example, as 158382225 + 1841182281 = 12585^2 + 42909^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 22810 + ... + 67226.

Almost surely, 2^1999564506 is an apocalyptic number.

1999564506 is an abundant number, since it is smaller than the sum of its proper divisors (2511349902).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1999564506 is a wasteful number, since it uses less digits than its factorization.

1999564506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44527 (or 44524 counting only the distinct ones).

The product of its (nonzero) digits is 2624400, while the sum is 54.

The square root of 1999564506 is about 44716.4903139770. The cubic root of 1999564506 is about 1259.8295952469.

The spelling of 1999564506 in words is "one billion, nine hundred ninety-nine million, five hundred sixty-four thousand, five hundred six".