9990766 has 4 divisors (see below), whose sum is σ = 14986152. Its totient is φ = 4995382.

The previous prime is 9990737. The next prime is 9990767. The reversal of 9990766 is 6670999.

9990766 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6670999 = 229 ⋅29131.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9990767) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2497690 + ... + 2497693.

It is an arithmetic number, because the mean of its divisors is an integer number (3746538).

Almost surely, 2^9990766 is an apocalyptic number.

9990766 is a deficient number, since it is larger than the sum of its proper divisors (4995386).

9990766 is a wasteful number, since it uses less digits than its factorization.

9990766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4995385.

The product of its (nonzero) digits is 183708, while the sum is 46.

The square root of 9990766 is about 3160.8172993705. The cubic root of 9990766 is about 215.3771350817.

The spelling of 9990766 in words is "nine million, nine hundred ninety thousand, seven hundred sixty-six".