622647 has 10 divisors (see below), whose sum is σ = 930248. Its totient is φ = 415044.

The previous prime is 622639. The next prime is 622663. The reversal of 622647 is 746226.

622647 is nontrivially palindromic in base 15.

It is not a de Polignac number, because 622647 - 2³ = 622639 is a prime.

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

It is an Ulam number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 622647.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 622647.

It is not an unprimeable number, because it can be changed into a prime (622607) 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, 3763 + ... + 3924.

2⁶²²⁶⁴⁷ is an apocalyptic number.

622647 is a deficient number, since it is larger than the sum of its proper divisors (307601).

622647 is an equidigital number, since it uses as much as digits as its factorization.

622647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7699 (or 7690 counting only the distinct ones).

The product of its digits is 4032, while the sum is 27.

The square root of 622647 is about 789.0798438688. The cubic root of 622647 is about 85.3913671123.

The spelling of 622647 in words is "six hundred twenty-two thousand, six hundred forty-seven".