7639649 has 4 divisors (see below), whose sum is σ = 7846164. Its totient is φ = 7433136.

The previous prime is 7639637. The next prime is 7639663. The reversal of 7639649 is 9469367.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7317025 + 322624 = 2705^2 + 568^2 .

It is a cyclic number.

It is not a de Polignac number, because 7639649 - 2⁴ = 7639633 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 (7639699) 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, 103202 + ... + 103275.

It is an arithmetic number, because the mean of its divisors is an integer number (1961541).

Almost surely, 2^7639649 is an apocalyptic number.

It is an amenable number.

7639649 is a deficient number, since it is larger than the sum of its proper divisors (206515).

7639649 is a wasteful number, since it uses less digits than its factorization.

7639649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206514.

The product of its digits is 244944, while the sum is 44.

The square root of 7639649 is about 2763.9914978162. The cubic root of 7639649 is about 196.9508238717.

The spelling of 7639649 in words is "seven million, six hundred thirty-nine thousand, six hundred forty-nine".