38644065 has 12 divisors (see below), whose sum is σ = 66983124. Its totient is φ = 20610144.

The previous prime is 38644007. The next prime is 38644087. The reversal of 38644065 is 56044683.

38644065 is a `hidden beast` number, since 3 + 8 + 644 + 0 + 6 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 11614464 + 27029601 = 3408^2 + 5199^2 .

It is not a de Polignac number, because 38644065 - 2¹¹ = 38642017 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 429334 + ... + 429423.

It is an arithmetic number, because the mean of its divisors is an integer number (5581927).

Almost surely, 2^38644065 is an apocalyptic number.

It is an amenable number.

38644065 is a deficient number, since it is larger than the sum of its proper divisors (28339059).

38644065 is a wasteful number, since it uses less digits than its factorization.

38644065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 858768 (or 858765 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 36.

The square root of 38644065 is about 6216.4350716468. The cubic root of 38644065 is about 338.0863223845.

The spelling of 38644065 in words is "thirty-eight million, six hundred forty-four thousand, sixty-five".