2909281820 has 24 divisors (see below), whose sum is σ = 6115127424. Its totient is φ = 1162639296.

The previous prime is 2909281819. The next prime is 2909281829. The reversal of 2909281820 is 281829092.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2909281829) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44684 + ... + 88403.

It is an arithmetic number, because the mean of its divisors is an integer number (254796976).

Almost surely, 2^2909281820 is an apocalyptic number.

2909281820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2909281820 is an abundant number, since it is smaller than the sum of its proper divisors (3205845604).

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

2909281820 is a wasteful number, since it uses less digits than its factorization.

2909281820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134189 (or 134187 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 41.

The square root of 2909281820 is about 53937.7587595184. The cubic root of 2909281820 is about 1427.5629378777.

The spelling of 2909281820 in words is "two billion, nine hundred nine million, two hundred eighty-one thousand, eight hundred twenty".