990723565 has 16 divisors (see below), whose sum is σ = 1293527088. Its totient is φ = 724064256.

The previous prime is 990723557. The next prime is 990723599. The reversal of 990723565 is 565327099.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 264582756 + 726140809 = 16266^2 + 26947^2 .

It is a cyclic number.

It is not a de Polignac number, because 990723565 - 2³ = 990723557 is a prime.

It is a Duffinian number.

It is a congruent number.

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, 72262 + ... + 84871.

It is an arithmetic number, because the mean of its divisors is an integer number (80845443).

Almost surely, 2^990723565 is an apocalyptic number.

It is an amenable number.

990723565 is a deficient number, since it is larger than the sum of its proper divisors (302803523).

990723565 is a wasteful number, since it uses less digits than its factorization.

990723565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157248.

The product of its (nonzero) digits is 510300, while the sum is 46.

The square root of 990723565 is about 31475.7615475782. The cubic root of 990723565 is about 996.8982440573.

The spelling of 990723565 in words is "nine hundred ninety million, seven hundred twenty-three thousand, five hundred sixty-five".