8990209840 has 20 divisors (see below), whose sum is σ = 20902238064. Its totient is φ = 3596083904.

The previous prime is 8990209793. The next prime is 8990209859. The reversal of 8990209840 is 489020998.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (20).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56188732 + ... + 56188891.

Almost surely, 2^8990209840 is an apocalyptic number.

8990209840 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

8990209840 is an abundant number, since it is smaller than the sum of its proper divisors (11912028224).

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

8990209840 is a wasteful number, since it uses less digits than its factorization.

8990209840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112377636 (or 112377630 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 49.

The square root of 8990209840 is about 94816.7170914496. The cubic root of 8990209840 is about 2079.3293140893.

The spelling of 8990209840 in words is "eight billion, nine hundred ninety million, two hundred nine thousand, eight hundred forty".