990206928 has 60 divisors (see below), whose sum is σ = 2778344868. Its totient is φ = 329218560.

The previous prime is 990206923. The next prime is 990206941. The reversal of 990206928 is 829602099.

990206928 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 2 ways, for example, as 467078544 + 523128384 = 21612^2 + 22872^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (990206923) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 48508 + ... + 65828.

Almost surely, 2^990206928 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 990206928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1389172434).

990206928 is an abundant number, since it is smaller than the sum of its proper divisors (1788137940).

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

990206928 is a wasteful number, since it uses less digits than its factorization.

990206928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17732 (or 17723 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 45.

The square root of 990206928 is about 31467.5535750716. The cubic root of 990206928 is about 996.7249282815.

The spelling of 990206928 in words is "nine hundred ninety million, two hundred six thousand, nine hundred twenty-eight".