638313762 has 8 divisors (see below), whose sum is σ = 1276627536. Its totient is φ = 212771252.

The previous prime is 638313749. The next prime is 638313769. The reversal of 638313762 is 267313836.

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

638313762 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 638313762.

It is not an unprimeable number, because it can be changed into a prime (638313769) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53192808 + ... + 53192819.

It is an arithmetic number, because the mean of its divisors is an integer number (159578442).

Almost surely, 2^638313762 is an apocalyptic number.

638313762 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

638313762 is a wasteful number, since it uses less digits than its factorization.

638313762 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106385632.

The product of its digits is 108864, while the sum is 39.

The square root of 638313762 is about 25264.8720954609. The cubic root of 638313762 is about 861.0163583247.

The spelling of 638313762 in words is "six hundred thirty-eight million, three hundred thirteen thousand, seven hundred sixty-two".