7638649 has 8 divisors (see below), whose sum is σ = 7853472. Its totient is φ = 7425600.

The previous prime is 7638643. The next prime is 7638689. The reversal of 7638649 is 9468367.

It is a happy number.

7638649 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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 7638649 - 2³ = 7638641 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7638641) by changing a digit.

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

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17022 + ... + 17464.

It is an arithmetic number, because the mean of its divisors is an integer number (981684).

Almost surely, 2^7638649 is an apocalyptic number.

It is an amenable number.

7638649 is a deficient number, since it is larger than the sum of its proper divisors (214823).

7638649 is a wasteful number, since it uses less digits than its factorization.

7638649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 887.

The product of its digits is 217728, while the sum is 43.

The square root of 7638649 is about 2763.8105940893. The cubic root of 7638649 is about 196.9422301340.

The spelling of 7638649 in words is "seven million, six hundred thirty-eight thousand, six hundred forty-nine".