3649566820 has 12 divisors (see below), whose sum is σ = 7664090364. Its totient is φ = 1459826720.

The previous prime is 3649566773. The next prime is 3649566827. The reversal of 3649566820 is 286659463.

It can be written as a sum of positive squares in 2 ways, for example, as 1601280256 + 2048286564 = 40016^2 + 45258^2 .

It is not an unprimeable number, because it can be changed into a prime (3649566827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 91239151 + ... + 91239190.

It is an arithmetic number, because the mean of its divisors is an integer number (638674197).

Almost surely, 2^3649566820 is an apocalyptic number.

It is an amenable number.

3649566820 is an abundant number, since it is smaller than the sum of its proper divisors (4014523544).

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

3649566820 is a wasteful number, since it uses less digits than its factorization.

3649566820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182478350 (or 182478348 counting only the distinct ones).

The product of its (nonzero) digits is 1866240, while the sum is 49.

The square root of 3649566820 is about 60411.6447384112. The cubic root of 3649566820 is about 1539.6208123596.

The spelling of 3649566820 in words is "three billion, six hundred forty-nine million, five hundred sixty-six thousand, eight hundred twenty".