662621 has 8 divisors (see below), whose sum is σ = 697080. Its totient is φ = 628992.

The previous prime is 662617. The next prime is 662639. The reversal of 662621 is 126266.

662621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 4900 + 657721 = 70^2 + 811^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 662621 - 2² = 662617 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (662671) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1961 + ... + 2273.

It is an arithmetic number, because the mean of its divisors is an integer number (87135).

2⁶⁶²⁶²¹ is an apocalyptic number.

It is an amenable number.

662621 is a deficient number, since it is larger than the sum of its proper divisors (34459).

662621 is a wasteful number, since it uses less digits than its factorization.

662621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 415.

The product of its digits is 864, while the sum is 23.

The square root of 662621 is about 814.0153561205. The cubic root of 662621 is about 87.1809770388.

Adding to 662621 its reverse (126266), we get a palindrome (788887).

The spelling of 662621 in words is "six hundred sixty-two thousand, six hundred twenty-one".