3654567621 has 24 divisors (see below), whose sum is σ = 5342864384. Its totient is φ = 2406983040.

The previous prime is 3654567619. The next prime is 3654567629. The reversal of 3654567621 is 1267654563.

3654567621 is a `hidden beast` number, since 3 + 65 + 4 + 567 + 6 + 21 = 666.

3654567621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 3654567621 - 2¹ = 3654567619 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3654567629) 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, 268830 + ... + 282096.

Almost surely, 2^3654567621 is an apocalyptic number.

It is an amenable number.

3654567621 is a deficient number, since it is larger than the sum of its proper divisors (1688296763).

3654567621 is a wasteful number, since it uses less digits than its factorization.

3654567621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13641 (or 13638 counting only the distinct ones).

The product of its digits is 907200, while the sum is 45.

The square root of 3654567621 is about 60453.0199493789. The cubic root of 3654567621 is about 1540.3237106936.

The spelling of 3654567621 in words is "three billion, six hundred fifty-four million, five hundred sixty-seven thousand, six hundred twenty-one".