638716 has 24 divisors (see below), whose sum is σ = 1227744. Its totient is φ = 288960.

The previous prime is 638699. The next prime is 638717. The reversal of 638716 is 617836.

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, 3606 + ... + 3778.

It is an arithmetic number, because the mean of its divisors is an integer number (51156).

2⁶³⁸⁷¹⁶ is an apocalyptic number.

It is an amenable number.

638716 is a deficient number, since it is larger than the sum of its proper divisors (589028).

638716 is a wasteful number, since it uses less digits than its factorization.

638716 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 261 (or 259 counting only the distinct ones).

The product of its digits is 6048, while the sum is 31.

The square root of 638716 is about 799.1970970918. The cubic root of 638716 is about 86.1197178895.

The spelling of 638716 in words is "six hundred thirty-eight thousand, seven hundred sixteen".