638750635 has 4 divisors (see below), whose sum is σ = 766500768. Its totient is φ = 511000504.

The previous prime is 638750621. The next prime is 638750699. The reversal of 638750635 is 536057836.

638750635 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 638750635 - 2¹³ = 638742443 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 638750591 and 638750600.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63875059 + ... + 63875068.

It is an arithmetic number, because the mean of its divisors is an integer number (191625192).

Almost surely, 2^638750635 is an apocalyptic number.

638750635 is a deficient number, since it is larger than the sum of its proper divisors (127750133).

638750635 is a wasteful number, since it uses less digits than its factorization.

638750635 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127750132.

The product of its (nonzero) digits is 453600, while the sum is 43.

The square root of 638750635 is about 25273.5164747607. The cubic root of 638750635 is about 861.2127450334.

The spelling of 638750635 in words is "six hundred thirty-eight million, seven hundred fifty thousand, six hundred thirty-five".