990888066 has 120 divisors (see below), whose sum is σ = 2630559360. Its totient is φ = 273085344.

The previous prime is 990888023. The next prime is 990888071. The reversal of 990888066 is 660888099.

It is a Harshad number since it is a multiple of its sum of digits (54).

990888066 is a strobogrammatic number because it is the same when read upside-down.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 953175 + ... + 954213.

It is an arithmetic number, because the mean of its divisors is an integer number (21921328).

Almost surely, 2^990888066 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 990888066, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1315279680).

990888066 is an abundant number, since it is smaller than the sum of its proper divisors (1639671294).

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

990888066 is a wasteful number, since it uses less digits than its factorization.

990888066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1118 (or 1080 counting only the distinct ones).

The product of its (nonzero) digits is 1492992, while the sum is 54.

The square root of 990888066 is about 31478.3745768424. The cubic root of 990888066 is about 996.9534164210.

The spelling of 990888066 in words is "nine hundred ninety million, eight hundred eighty-eight thousand, sixty-six".