638311487 has 8 divisors (see below), whose sum is σ = 696622032. Its totient is φ = 580048000.

The previous prime is 638311477. The next prime is 638311519. The reversal of 638311487 is 784113836.

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 638311487 - 2¹⁸ = 638049343 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 (638311447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20453 + ... + 41169.

It is an arithmetic number, because the mean of its divisors is an integer number (87077754).

Almost surely, 2^638311487 is an apocalyptic number.

638311487 is a deficient number, since it is larger than the sum of its proper divisors (58310545).

638311487 is a wasteful number, since it uses less digits than its factorization.

638311487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23529.

The product of its digits is 96768, while the sum is 41.

The square root of 638311487 is about 25264.8270724341. The cubic root of 638311487 is about 861.0153354136.

It can be divided in two parts, 6 and 38311487, that multiplied together give a palindrome (229868922).

The spelling of 638311487 in words is "six hundred thirty-eight million, three hundred eleven thousand, four hundred eighty-seven".