3645281 has 4 divisors (see below), whose sum is σ = 3674112. Its totient is φ = 3616452.

The previous prime is 3645263. The next prime is 3645289. The reversal of 3645281 is 1825463.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 3645281 - 2¹⁴ = 3628897 is a prime.

It is a super-2 number, since 2×3645281² = 26576147137922, which contains 22 as substring.

It is a d-powerful number, because it can be written as 3⁵ + 6⁸ + 4⁶ + 5⁹ + 2¹³ + 8 + 1 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3645289) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14225 + ... + 14478.

It is an arithmetic number, because the mean of its divisors is an integer number (918528).

Almost surely, 2^3645281 is an apocalyptic number.

It is an amenable number.

3645281 is a deficient number, since it is larger than the sum of its proper divisors (28831).

3645281 is a wasteful number, since it uses less digits than its factorization.

3645281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28830.

The product of its digits is 5760, while the sum is 29.

The square root of 3645281 is about 1909.2618992689. The cubic root of 3645281 is about 153.9017898585.

The spelling of 3645281 in words is "three million, six hundred forty-five thousand, two hundred eighty-one".