612638 has 8 divisors (see below), whose sum is σ = 989688. Its totient is φ = 282744.

The previous prime is 612637. The next prime is 612643. The reversal of 612638 is 836216.

612638 = 82² + 83² + ... + 133².

612638 is nontrivially palindromic in base 12.

612638 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 (26), and also a Moran number because the ratio is a prime number: 23563 = 612638 / (6 + 1 + 2 + 6 + 3 + 8).

It is a plaindrome in base 9.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (612637) 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, 11756 + ... + 11807.

It is an arithmetic number, because the mean of its divisors is an integer number (123711).

2⁶¹²⁶³⁸ is an apocalyptic number.

612638 is a deficient number, since it is larger than the sum of its proper divisors (377050).

612638 is a wasteful number, since it uses less digits than its factorization.

612638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23578.

The product of its digits is 1728, while the sum is 26.

The square root of 612638 is about 782.7119521254. The cubic root of 612638 is about 84.9313401712.

The spelling of 612638 in words is "six hundred twelve thousand, six hundred thirty-eight".