638295655 has 32 divisors (see below), whose sum is σ = 846236160. Its totient is φ = 460521600.

The previous prime is 638295631. The next prime is 638295661. The reversal of 638295655 is 556592836.

It is not a de Polignac number, because 638295655 - 2⁷ = 638295527 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 638295599 and 638295608.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 141180 + ... + 145630.

It is an arithmetic number, because the mean of its divisors is an integer number (26444880).

Almost surely, 2^638295655 is an apocalyptic number.

638295655 is a deficient number, since it is larger than the sum of its proper divisors (207940505).

638295655 is a wasteful number, since it uses less digits than its factorization.

638295655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4551.

The product of its digits is 1944000, while the sum is 49.

The square root of 638295655 is about 25264.5137495262. The cubic root of 638295655 is about 861.0082167849.

The spelling of 638295655 in words is "six hundred thirty-eight million, two hundred ninety-five thousand, six hundred fifty-five".