638455609 has 8 divisors (see below), whose sum is σ = 715321728. Its totient is φ = 564726960.

The previous prime is 638455607. The next prime is 638455673. The reversal of 638455609 is 906554836.

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 638455609 - 2¹ = 638455607 is a prime.

It is not an unprimeable number, because it can be changed into a prime (638455603) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 783937 + ... + 784750.

It is an arithmetic number, because the mean of its divisors is an integer number (89415216).

Almost surely, 2^638455609 is an apocalyptic number.

It is an amenable number.

638455609 is a deficient number, since it is larger than the sum of its proper divisors (76866119).

638455609 is a wasteful number, since it uses less digits than its factorization.

638455609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1568735.

The product of its (nonzero) digits is 777600, while the sum is 46.

The square root of 638455609 is about 25267.6791375860. The cubic root of 638455609 is about 861.0801323644.

The spelling of 638455609 in words is "six hundred thirty-eight million, four hundred fifty-five thousand, six hundred nine".