3645200731 has 4 divisors (see below), whose sum is σ = 3661259112. Its totient is φ = 3629142352.

The previous prime is 3645200719. The next prime is 3645200737. The reversal of 3645200731 is 1370025463.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1370025463 = 30661 ⋅44683.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3645200731 is a prime.

It is a super-2 number, since 2×3645200731² = 26574976738565868722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3645200693 and 3645200702.

It is not an unprimeable number, because it can be changed into a prime (3645200737) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8028850 + ... + 8029303.

It is an arithmetic number, because the mean of its divisors is an integer number (915314778).

Almost surely, 2^3645200731 is an apocalyptic number.

3645200731 is a deficient number, since it is larger than the sum of its proper divisors (16058381).

3645200731 is a wasteful number, since it uses less digits than its factorization.

3645200731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16058380.

The product of its (nonzero) digits is 15120, while the sum is 31.

The square root of 3645200731 is about 60375.4977702048. The cubic root of 3645200731 is about 1539.0066021227.

The spelling of 3645200731 in words is "three billion, six hundred forty-five million, two hundred thousand, seven hundred thirty-one".