638026835 has 16 divisors (see below), whose sum is σ = 771513600. Its totient is φ = 506515680.

The previous prime is 638026811. The next prime is 638026867. The reversal of 638026835 is 538620836.

It is not a de Polignac number, because 638026835 - 2⁶ = 638026771 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 638026792 and 638026801.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 567584 + ... + 568706.

It is an arithmetic number, because the mean of its divisors is an integer number (48219600).

Almost surely, 2^638026835 is an apocalyptic number.

638026835 is a deficient number, since it is larger than the sum of its proper divisors (133486765).

638026835 is a wasteful number, since it uses less digits than its factorization.

638026835 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1898.

The product of its (nonzero) digits is 207360, while the sum is 41.

The square root of 638026835 is about 25259.1930789564. The cubic root of 638026835 is about 860.8873278063.

The spelling of 638026835 in words is "six hundred thirty-eight million, twenty-six thousand, eight hundred thirty-five".