638825071 has 8 divisors (see below), whose sum is σ = 654027264. Its totient is φ = 623638680.

The previous prime is 638825053. The next prime is 638825107. The reversal of 638825071 is 170528836.

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 638825071 - 2⁵ = 638825039 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 (638825171) 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, 133836 + ... + 138526.

It is an arithmetic number, because the mean of its divisors is an integer number (81753408).

Almost surely, 2^638825071 is an apocalyptic number.

638825071 is a deficient number, since it is larger than the sum of its proper divisors (15202193).

638825071 is a wasteful number, since it uses less digits than its factorization.

638825071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7901.

The product of its (nonzero) digits is 80640, while the sum is 40.

The square root of 638825071 is about 25274.9890405515. The cubic root of 638825071 is about 861.2461971811.

The spelling of 638825071 in words is "six hundred thirty-eight million, eight hundred twenty-five thousand, seventy-one".