9991662 has 8 divisors (see below), whose sum is σ = 19983336. Its totient is φ = 3330552.

The previous prime is 9991649. The next prime is 9991669. The reversal of 9991662 is 2661999.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

9991662 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9991669) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 832633 + ... + 832644.

It is an arithmetic number, because the mean of its divisors is an integer number (2497917).

Almost surely, 2^9991662 is an apocalyptic number.

9991662 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

9991662 is a wasteful number, since it uses less digits than its factorization.

9991662 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1665282.

The product of its digits is 52488, while the sum is 42.

The square root of 9991662 is about 3160.9590316864. The cubic root of 9991662 is about 215.3835734316.

The spelling of 9991662 in words is "nine million, nine hundred ninety-one thousand, six hundred sixty-two".