7664647 has 4 divisors (see below), whose sum is σ = 7673176. Its totient is φ = 7656120.

The previous prime is 7664641. The next prime is 7664651. The reversal of 7664647 is 7464667.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 7664647 - 2⁷ = 7664519 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7664641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2733 + ... + 4774.

It is an arithmetic number, because the mean of its divisors is an integer number (1918294).

Almost surely, 2^7664647 is an apocalyptic number.

7664647 is a deficient number, since it is larger than the sum of its proper divisors (8529).

7664647 is a wasteful number, since it uses less digits than its factorization.

7664647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8528.

The product of its digits is 169344, while the sum is 40.

The square root of 7664647 is about 2768.5098880083. The cubic root of 7664647 is about 197.1654068734.

The spelling of 7664647 in words is "seven million, six hundred sixty-four thousand, six hundred forty-seven".