638662 has 8 divisors (see below), whose sum is σ = 988992. Its totient is φ = 309000.

The previous prime is 638633. The next prime is 638663. The reversal of 638662 is 266836.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638663) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5089 + ... + 5212.

It is an arithmetic number, because the mean of its divisors is an integer number (123624).

2⁶³⁸⁶⁶² is an apocalyptic number.

638662 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

638662 is a deficient number, since it is larger than the sum of its proper divisors (350330).

638662 is a wasteful number, since it uses less digits than its factorization.

638662 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10334.

The product of its digits is 10368, while the sum is 31.

The square root of 638662 is about 799.1633124712. The cubic root of 638662 is about 86.1172908349.

638662 divided by its sum of digits (31) gives a palindrome (20602).

The spelling of 638662 in words is "six hundred thirty-eight thousand, six hundred sixty-two".