638272207 has 8 divisors (see below), whose sum is σ = 650250000. Its totient is φ = 626333184.

The previous prime is 638272199. The next prime is 638272231. The reversal of 638272207 is 702272836.

It is a happy number.

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 638272207 - 2³ = 638272199 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 (638272277) 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, 24669 + ... + 43417.

It is an arithmetic number, because the mean of its divisors is an integer number (81281250).

Almost surely, 2^638272207 is an apocalyptic number.

638272207 is a deficient number, since it is larger than the sum of its proper divisors (11977793).

638272207 is a wasteful number, since it uses less digits than its factorization.

638272207 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19385.

The product of its (nonzero) digits is 56448, while the sum is 37.

The square root of 638272207 is about 25264.0496951696. The cubic root of 638272207 is about 860.9976735162.

The spelling of 638272207 in words is "six hundred thirty-eight million, two hundred seventy-two thousand, two hundred seven".