9945890786 has 16 divisors (see below), whose sum is σ = 16075740408. Its totient is φ = 4587753600.

The previous prime is 9945890737. The next prime is 9945890789. The reversal of 9945890786 is 6870985499.

9945890786 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 2057076025 + 7888814761 = 45355^2 + 88819^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (9945890789) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64595 + ... + 155126.

Almost surely, 2^9945890786 is an apocalyptic number.

9945890786 is a deficient number, since it is larger than the sum of its proper divisors (6129849622).

9945890786 is a wasteful number, since it uses less digits than its factorization.

9945890786 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221477.

The product of its (nonzero) digits is 39191040, while the sum is 65.

The square root of 9945890786 is about 99729.0869606255. The cubic root of 9945890786 is about 2150.5418346651.

The spelling of 9945890786 in words is "nine billion, nine hundred forty-five million, eight hundred ninety thousand, seven hundred eighty-six".