3665735720 has 32 divisors (see below), whose sum is σ = 8532318600. Its totient is φ = 1415731968.

The previous prime is 3665735659. The next prime is 3665735729. The reversal of 3665735720 is 275375663.

3665735720 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 1960541284 + 1705194436 = 44278^2 + 41294^2 .

It is not an unprimeable number, because it can be changed into a prime (3665735729) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1578899 + ... + 1581218.

Almost surely, 2^3665735720 is an apocalyptic number.

It is an amenable number.

3665735720 is an abundant number, since it is smaller than the sum of its proper divisors (4866582880).

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

3665735720 is a wasteful number, since it uses less digits than its factorization.

3665735720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3160157 (or 3160153 counting only the distinct ones).

The product of its (nonzero) digits is 793800, while the sum is 44.

The square root of 3665735720 is about 60545.3195548591. The cubic root of 3665735720 is about 1541.8911550510.

The spelling of 3665735720 in words is "three billion, six hundred sixty-five million, seven hundred thirty-five thousand, seven hundred twenty".