2009620816 has 20 divisors (see below), whose sum is σ = 4449874912. Its totient is φ = 861266016.

The previous prime is 2009620763. The next prime is 2009620891. The reversal of 2009620816 is 6180269002.

It is a happy number.

It is a nialpdrome in base 15.

It is a zygodrome in base 15.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8971410 + ... + 8971633.

Almost surely, 2^2009620816 is an apocalyptic number.

It is an amenable number.

2009620816 is an abundant number, since it is smaller than the sum of its proper divisors (2440254096).

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

2009620816 is a wasteful number, since it uses less digits than its factorization.

2009620816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17943058 (or 17943052 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 2009620816 is about 44828.7944963948. The cubic root of 2009620816 is about 1261.9380638897.

Adding to 2009620816 its reverse (6180269002), we get a palindrome (8189889818).

The spelling of 2009620816 in words is "two billion, nine million, six hundred twenty thousand, eight hundred sixteen".