6623613 has 10 divisors (see below), whose sum is σ = 9894654. Its totient is φ = 4415688.

The previous prime is 6623611. The next prime is 6623707. The reversal of 6623613 is 3163266.

It can be written as a sum of positive squares in only one way, i.e., 6260004 + 363609 = 2502^2 + 603^2 .

It is not a de Polignac number, because 6623613 - 2¹ = 6623611 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6623611) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 40806 + ... + 40967.

Almost surely, 2^6623613 is an apocalyptic number.

It is an amenable number.

6623613 is a deficient number, since it is larger than the sum of its proper divisors (3271041).

6623613 is an equidigital number, since it uses as much as digits as its factorization.

6623613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81785 (or 81776 counting only the distinct ones).

The product of its digits is 3888, while the sum is 27.

The square root of 6623613 is about 2573.6380864449. The cubic root of 6623613 is about 187.8011799577.

Adding to 6623613 its reverse (3163266), we get a palindrome (9786879).

The spelling of 6623613 in words is "six million, six hundred twenty-three thousand, six hundred thirteen".