3649421620 has 48 divisors (see below), whose sum is σ = 8738806608. Its totient is φ = 1268213760.

The previous prime is 3649421617. The next prime is 3649421627. The reversal of 3649421620 is 261249463.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 7540516 + 3641881104 = 2746^2 + 60348^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 3649421620.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3649421627) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 408411 + ... + 417250.

It is an arithmetic number, because the mean of its divisors is an integer number (182058471).

Almost surely, 2^3649421620 is an apocalyptic number.

It is an amenable number.

3649421620 is an abundant number, since it is smaller than the sum of its proper divisors (5089384988).

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

3649421620 is a wasteful number, since it uses less digits than its factorization.

3649421620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 825700 (or 825698 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 37.

The square root of 3649421620 is about 60410.4429713936. The cubic root of 3649421620 is about 1539.6003938718.

The spelling of 3649421620 in words is "three billion, six hundred forty-nine million, four hundred twenty-one thousand, six hundred twenty".