638098659 has 12 divisors (see below), whose sum is σ = 1005488952. Its totient is φ = 386726400.

The previous prime is 638098651. The next prime is 638098661. The reversal of 638098659 is 956890836.

It is not a de Polignac number, because 638098659 - 2³ = 638098651 is a prime.

It is not an unprimeable number, because it can be changed into a prime (638098651) 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 11 ways as a sum of consecutive naturals, for example, 3222622 + ... + 3222819.

It is an arithmetic number, because the mean of its divisors is an integer number (83790746).

Almost surely, 2^638098659 is an apocalyptic number.

638098659 is a deficient number, since it is larger than the sum of its proper divisors (367390293).

638098659 is a wasteful number, since it uses less digits than its factorization.

638098659 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6445458 (or 6445455 counting only the distinct ones).

The product of its (nonzero) digits is 2799360, while the sum is 54.

The square root of 638098659 is about 25260.6147787420. The cubic root of 638098659 is about 860.9196305497.

The spelling of 638098659 in words is "six hundred thirty-eight million, ninety-eight thousand, six hundred fifty-nine".