623638 has 8 divisors (see below), whose sum is σ = 941688. Its totient is φ = 309744.

The previous prime is 623633. The next prime is 623641. The reversal of 623638 is 836326.

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

It is a d-powerful number, because it can be written as 6² + 2⁷ + 6³ + 3¹⁰ + 3¹² + 8⁵ .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (623633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 631 + ... + 1282.

It is an arithmetic number, because the mean of its divisors is an integer number (117711).

2⁶²³⁶³⁸ is an apocalyptic number.

623638 is a deficient number, since it is larger than the sum of its proper divisors (318050).

623638 is a wasteful number, since it uses less digits than its factorization.

623638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2078.

The product of its digits is 5184, while the sum is 28.

The square root of 623638 is about 789.7075408023. The cubic root of 623638 is about 85.4366458387.

The spelling of 623638 in words is "six hundred twenty-three thousand, six hundred thirty-eight".