7638665 has 8 divisors (see below), whose sum is σ = 9648960. Its totient is φ = 5789232.

The previous prime is 7638643. The next prime is 7638689. The reversal of 7638665 is 5668367.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 7638665 - 2⁶ = 7638601 is a prime.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 40109 + ... + 40298.

It is an arithmetic number, because the mean of its divisors is an integer number (1206120).

Almost surely, 2^7638665 is an apocalyptic number.

It is an amenable number.

7638665 is a deficient number, since it is larger than the sum of its proper divisors (2010295).

7638665 is a wasteful number, since it uses less digits than its factorization.

7638665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80431.

The product of its digits is 181440, while the sum is 41.

The square root of 7638665 is about 2763.8134886421. The cubic root of 7638665 is about 196.9423676397.

The spelling of 7638665 in words is "seven million, six hundred thirty-eight thousand, six hundred sixty-five".