3651660 has 36 divisors (see below), whose sum is σ = 11077248. Its totient is φ = 973728.

The previous prime is 3651653. The next prime is 3651671. The reversal of 3651660 is 661563.

3651660 is a `hidden beast` number, since 3 + 651 + 6 + 6 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9964 + ... + 10323.

Almost surely, 2^3651660 is an apocalyptic number.

3651660 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

3651660 is an abundant number, since it is smaller than the sum of its proper divisors (7425588).

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

3651660 is a wasteful number, since it uses less digits than its factorization.

3651660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20302 (or 20297 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 27.

The square root of 3651660 is about 1910.9317099258. The cubic root of 3651660 is about 153.9915101858.

It can be divided in two parts, 365 and 1660, that added together give a square (2025 = 45²).

The spelling of 3651660 in words is "three million, six hundred fifty-one thousand, six hundred sixty".