7640865 has 16 divisors (see below), whose sum is σ = 13584000. Its totient is φ = 4075056.

The previous prime is 7640861. The next prime is 7640873. The reversal of 7640865 is 5680467.

It is a happy number.

7640865 is a `hidden beast` number, since 7 + 640 + 8 + 6 + 5 = 666.

It is not a de Polignac number, because 7640865 - 2² = 7640861 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (7640861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28165 + ... + 28434.

It is an arithmetic number, because the mean of its divisors is an integer number (849000).

Almost surely, 2^7640865 is an apocalyptic number.

It is an amenable number.

7640865 is a deficient number, since it is larger than the sum of its proper divisors (5943135).

7640865 is a wasteful number, since it uses less digits than its factorization.

7640865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56613 (or 56607 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 36.

The square root of 7640865 is about 2764.2114607967. The cubic root of 7640865 is about 196.9612728463.

The spelling of 7640865 in words is "seven million, six hundred forty thousand, eight hundred sixty-five".