638314651 has 8 divisors (see below), whose sum is σ = 687768480. Its totient is φ = 588911232.

The previous prime is 638314603. The next prime is 638314667. The reversal of 638314651 is 156413836.

638314651 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-638314651 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 638314651.

It is not an unprimeable number, because it can be changed into a prime (638314601) 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, 16146 + ... + 39208.

It is an arithmetic number, because the mean of its divisors is an integer number (85971060).

Almost surely, 2^638314651 is an apocalyptic number.

638314651 is a deficient number, since it is larger than the sum of its proper divisors (49453829).

638314651 is a wasteful number, since it uses less digits than its factorization.

638314651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25205.

The product of its digits is 51840, while the sum is 37.

The square root of 638314651 is about 25264.8896890527. The cubic root of 638314651 is about 861.0167580462.

The spelling of 638314651 in words is "six hundred thirty-eight million, three hundred fourteen thousand, six hundred fifty-one".