3657648621 has 24 divisors (see below), whose sum is σ = 5368058752. Its totient is φ = 2213640000.

The previous prime is 3657648593. The next prime is 3657648647. The reversal of 3657648621 is 1268467563.

3657648621 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 3657648621 - 2²² = 3653454317 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3657648661) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 265905 + ... + 279321.

Almost surely, 2^3657648621 is an apocalyptic number.

It is an amenable number.

3657648621 is a deficient number, since it is larger than the sum of its proper divisors (1710410131).

3657648621 is a wasteful number, since it uses less digits than its factorization.

3657648621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14193 (or 14182 counting only the distinct ones).

The product of its digits is 1451520, while the sum is 48.

The square root of 3657648621 is about 60478.4971787494. The cubic root of 3657648621 is about 1540.7564480997.

The spelling of 3657648621 in words is "three billion, six hundred fifty-seven million, six hundred forty-eight thousand, six hundred twenty-one".