621602 has 4 divisors (see below), whose sum is σ = 932406. Its totient is φ = 310800.

The previous prime is 621583. The next prime is 621611. The reversal of 621602 is 206126.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 519841 + 101761 = 721^2 + 319^2 .

It is a congruent number.

It is an unprimeable number.

621602 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155399 + ... + 155402.

2⁶²¹⁶⁰² is an apocalyptic number.

621602 is a deficient number, since it is larger than the sum of its proper divisors (310804).

621602 is a wasteful number, since it uses less digits than its factorization.

621602 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 310803.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 621602 is about 788.4174021418. The cubic root of 621602 is about 85.3435690576.

Adding to 621602 its reverse (206126), we get a palindrome (827728).

The spelling of 621602 in words is "six hundred twenty-one thousand, six hundred two".