638483649 has 8 divisors (see below), whose sum is σ = 851434752. Its totient is φ = 425594160.

The previous prime is 638483639. The next prime is 638483687. The reversal of 638483649 is 946384836.

It is a happy number.

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

It is not a de Polignac number, because 638483649 - 2²¹ = 636386497 is a prime.

It is a super-2 number, since 2×638483649² = 815322740080710402, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (638483639) 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, 21219 + ... + 41559.

It is an arithmetic number, because the mean of its divisors is an integer number (106429344).

Almost surely, 2^638483649 is an apocalyptic number.

It is an amenable number.

638483649 is a deficient number, since it is larger than the sum of its proper divisors (212951103).

638483649 is a wasteful number, since it uses less digits than its factorization.

638483649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30807.

The product of its digits is 2985984, while the sum is 51.

The square root of 638483649 is about 25268.2339905265. The cubic root of 638483649 is about 861.0927379568.

The spelling of 638483649 in words is "six hundred thirty-eight million, four hundred eighty-three thousand, six hundred forty-nine".