638327455 has 4 divisors (see below), whose sum is σ = 765992952. Its totient is φ = 510661960.

The previous prime is 638327447. The next prime is 638327461. The reversal of 638327455 is 554723836.

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

It is not a de Polignac number, because 638327455 - 2³ = 638327447 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63832741 + ... + 63832750.

It is an arithmetic number, because the mean of its divisors is an integer number (191498238).

Almost surely, 2^638327455 is an apocalyptic number.

638327455 is a deficient number, since it is larger than the sum of its proper divisors (127665497).

638327455 is a wasteful number, since it uses less digits than its factorization.

638327455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127665496.

The product of its digits is 604800, while the sum is 43.

The square root of 638327455 is about 25265.1430829117. The cubic root of 638327455 is about 861.0225150736.

The spelling of 638327455 in words is "six hundred thirty-eight million, three hundred twenty-seven thousand, four hundred fifty-five".