3651621536 has 48 divisors (see below), whose sum is σ = 7446637800. Its totient is φ = 1760575488.

The previous prime is 3651621529. The next prime is 3651621559. The reversal of 3651621536 is 6351261563.

It can be written as a sum of positive squares in 4 ways, for example, as 3108731536 + 542890000 = 55756^2 + 23300^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 3651621536.

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, 882320 + ... + 886448.

Almost surely, 2^3651621536 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3651621536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3723318900).

3651621536 is an abundant number, since it is smaller than the sum of its proper divisors (3795016264).

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

3651621536 is a wasteful number, since it uses less digits than its factorization.

3651621536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5121 (or 5113 counting only the distinct ones).

The product of its digits is 97200, while the sum is 38.

The square root of 3651621536 is about 60428.6483052534. The cubic root of 3651621536 is about 1539.9096950476.

The spelling of 3651621536 in words is "three billion, six hundred fifty-one million, six hundred twenty-one thousand, five hundred thirty-six".