6620623 has 4 divisors (see below), whose sum is σ = 6627240. Its totient is φ = 6614008.

The previous prime is 6620617. The next prime is 6620629. The reversal of 6620623 is 3260266.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 3260266 = 2 ⋅1630133.

It is an interprime number because it is at equal distance from previous prime (6620617) and next prime (6620629).

It is a cyclic number.

It is not a de Polignac number, because 6620623 - 2¹⁷ = 6489551 is a prime.

It is a Duffinian number.

6620623 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6620629) 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, 1465 + ... + 3922.

It is an arithmetic number, because the mean of its divisors is an integer number (1656810).

Almost surely, 2^6620623 is an apocalyptic number.

6620623 is a deficient number, since it is larger than the sum of its proper divisors (6617).

6620623 is a wasteful number, since it uses less digits than its factorization.

6620623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6616.

The product of its (nonzero) digits is 2592, while the sum is 25.

The square root of 6620623 is about 2573.0571311185. The cubic root of 6620623 is about 187.7729169315.

Adding to 6620623 its reverse (3260266), we get a palindrome (9880889).

The spelling of 6620623 in words is "six million, six hundred twenty thousand, six hundred twenty-three".