638308275 has 72 divisors (see below), whose sum is σ = 1191975792. Its totient is φ = 300960000.

The previous prime is 638308207. The next prime is 638308283. The reversal of 638308275 is 572803836.

638308275 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 638308275 - 2⁷ = 638308147 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 334825 + ... + 336725.

Almost surely, 2^638308275 is an apocalyptic number.

638308275 is a deficient number, since it is larger than the sum of its proper divisors (553667517).

638308275 is a wasteful number, since it uses less digits than its factorization.

638308275 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1973 (or 1957 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 42.

The square root of 638308275 is about 25264.7635057208. The cubic root of 638308275 is about 861.0138911940.

The spelling of 638308275 in words is "six hundred thirty-eight million, three hundred eight thousand, two hundred seventy-five".