638710 has 16 divisors (see below), whose sum is σ = 1200096. Its totient is φ = 244288.

The previous prime is 638699. The next prime is 638717. The reversal of 638710 is 17836.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638717) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1159 + ... + 1618.

It is an arithmetic number, because the mean of its divisors is an integer number (75006).

2⁶³⁸⁷¹⁰ is an apocalyptic number.

638710 is a deficient number, since it is larger than the sum of its proper divisors (561386).

638710 is a wasteful number, since it uses less digits than its factorization.

638710 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2807.

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 638710 is about 799.1933433156. The cubic root of 638710 is about 86.1194482235.

The spelling of 638710 in words is "six hundred thirty-eight thousand, seven hundred ten".