638620082 has 8 divisors (see below), whose sum is σ = 958221036. Its totient is φ = 319213072.

The previous prime is 638620069. The next prime is 638620091. The reversal of 638620082 is 280026836.

It can be written as a sum of positive squares in 2 ways, for example, as 624550081 + 14070001 = 24991^2 + 3751^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39953 + ... + 53604.

Almost surely, 2^638620082 is an apocalyptic number.

638620082 is a deficient number, since it is larger than the sum of its proper divisors (319600954).

638620082 is a wasteful number, since it uses less digits than its factorization.

638620082 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96972.

The product of its (nonzero) digits is 27648, while the sum is 35.

The square root of 638620082 is about 25270.9335403344. The cubic root of 638620082 is about 861.1540671695.

The spelling of 638620082 in words is "six hundred thirty-eight million, six hundred twenty thousand, eighty-two".