638311485 has 24 divisors (see below), whose sum is σ = 1188042336. Its totient is φ = 291799200.

The previous prime is 638311477. The next prime is 638311519. The reversal of 638311485 is 584113836.

It is not a de Polignac number, because 638311485 - 2³ = 638311477 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 433491 + ... + 434960.

It is an arithmetic number, because the mean of its divisors is an integer number (49501764).

Almost surely, 2^638311485 is an apocalyptic number.

It is an amenable number.

638311485 is a deficient number, since it is larger than the sum of its proper divisors (549730851).

638311485 is a wasteful number, since it uses less digits than its factorization.

638311485 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 868473 (or 868466 counting only the distinct ones).

The product of its digits is 69120, while the sum is 39.

The square root of 638311485 is about 25264.8270328534. The cubic root of 638311485 is about 861.0153345144.

The spelling of 638311485 in words is "six hundred thirty-eight million, three hundred eleven thousand, four hundred eighty-five".