638770285 has 8 divisors (see below), whose sum is σ = 779516640. Its totient is φ = 502354704.

The previous prime is 638770273. The next prime is 638770303. The reversal of 638770285 is 582077836.

638770285 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 638770285 - 2¹³ = 638762093 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1082367 + ... + 1082956.

It is an arithmetic number, because the mean of its divisors is an integer number (97439580).

Almost surely, 2^638770285 is an apocalyptic number.

It is an amenable number.

638770285 is a deficient number, since it is larger than the sum of its proper divisors (140746355).

638770285 is a wasteful number, since it uses less digits than its factorization.

638770285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2165387.

The product of its (nonzero) digits is 564480, while the sum is 46.

The square root of 638770285 is about 25273.9052186242. The cubic root of 638770285 is about 861.2215761567.

The spelling of 638770285 in words is "six hundred thirty-eight million, seven hundred seventy thousand, two hundred eighty-five".