3651640 has 16 divisors (see below), whose sum is σ = 8216280. Its totient is φ = 1460640.

The previous prime is 3651623. The next prime is 3651653. The reversal of 3651640 is 461563.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45606 + ... + 45685.

Almost surely, 2^3651640 is an apocalyptic number.

It is an amenable number.

3651640 is an abundant number, since it is smaller than the sum of its proper divisors (4564640).

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

3651640 is a wasteful number, since it uses less digits than its factorization.

3651640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91302 (or 91298 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 3651640 is about 1910.9264768693. The cubic root of 3651640 is about 153.9912290501.

The spelling of 3651640 in words is "three million, six hundred fifty-one thousand, six hundred forty".