63979609 has 4 divisors (see below), whose sum is σ = 64856116. Its totient is φ = 63103104.

The previous prime is 63979607. The next prime is 63979613. The reversal of 63979609 is 90697936.

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 40602384 + 23377225 = 6372^2 + 4835^2 .

It is a cyclic number.

It is not a de Polignac number, because 63979609 - 2¹ = 63979607 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63979603) 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, 438144 + ... + 438289.

It is an arithmetic number, because the mean of its divisors is an integer number (16214029).

Almost surely, 2^63979609 is an apocalyptic number.

It is an amenable number.

63979609 is a deficient number, since it is larger than the sum of its proper divisors (876507).

63979609 is an equidigital number, since it uses as much as digits as its factorization.

63979609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 876506.

The product of its (nonzero) digits is 551124, while the sum is 49.

The square root of 63979609 is about 7998.7254609719. The cubic root of 63979609 is about 399.9575142376.

The spelling of 63979609 in words is "sixty-three million, nine hundred seventy-nine thousand, six hundred nine".