3665720 has 32 divisors (see below), whose sum is σ = 8331120. Its totient is φ = 1451520.

The previous prime is 3665677. The next prime is 3665731. The reversal of 3665720 is 275663.

It is a congruent number.

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, 4115 + ... + 4925.

Almost surely, 2^3665720 is an apocalyptic number.

It is an amenable number.

3665720 is an abundant number, since it is smaller than the sum of its proper divisors (4665400).

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

3665720 is a wasteful number, since it uses less digits than its factorization.

3665720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 935 (or 931 counting only the distinct ones).

The product of its (nonzero) digits is 7560, while the sum is 29.

The square root of 3665720 is about 1914.6070092842. The cubic root of 3665720 is about 154.1888950986.

It can be divided in two parts, 36 and 65720, that added together give a palindrome (65756).

The spelling of 3665720 in words is "three million, six hundred sixty-five thousand, seven hundred twenty".