3645647 has 6 divisors (see below), whose sum is σ = 3748248. Its totient is φ = 3545784.

The previous prime is 3645643. The next prime is 3645659. The reversal of 3645647 is 7465463.

It is not a de Polignac number, because 3645647 - 2² = 3645643 is a prime.

It is a d-powerful number, because it can be written as 3 + 6⁵ + 4⁵ + 5⁹ + 6⁸ + 4⁶ + 7 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3645643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is an upside-down number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 38 + ... + 2700.

It is an arithmetic number, because the mean of its divisors is an integer number (624708).

Almost surely, 2^3645647 is an apocalyptic number.

3645647 is a gapful number since it is divisible by the number (37) formed by its first and last digit.

3645647 is a deficient number, since it is larger than the sum of its proper divisors (102601).

3645647 is an equidigital number, since it uses as much as digits as its factorization.

3645647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2737 (or 2700 counting only the distinct ones).

The product of its digits is 60480, while the sum is 35.

The square root of 3645647 is about 1909.3577454212. The cubic root of 3645647 is about 153.9069404600.

The spelling of 3645647 in words is "three million, six hundred forty-five thousand, six hundred forty-seven".