3649201820 has 24 divisors (see below), whose sum is σ = 8359990128. Its totient is φ = 1326982400.

The previous prime is 3649201819. The next prime is 3649201877. The reversal of 3649201820 is 281029463.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8293421 + ... + 8293860.

It is an arithmetic number, because the mean of its divisors is an integer number (348332922).

Almost surely, 2^3649201820 is an apocalyptic number.

It is an amenable number.

3649201820 is an abundant number, since it is smaller than the sum of its proper divisors (4710788308).

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

3649201820 is a wasteful number, since it uses less digits than its factorization.

3649201820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16587301 (or 16587299 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 3649201820 is about 60408.6237221144. The cubic root of 3649201820 is about 1539.5694838632.

The spelling of 3649201820 in words is "three billion, six hundred forty-nine million, two hundred one thousand, eight hundred twenty".