620651 has 4 divisors (see below), whose sum is σ = 640704. Its totient is φ = 600600.

The previous prime is 620647. The next prime is 620657. The reversal of 620651 is 156026.

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

It is a cyclic number.

It is not a de Polignac number, because 620651 - 2² = 620647 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (620657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9980 + ... + 10041.

It is an arithmetic number, because the mean of its divisors is an integer number (160176).

2⁶²⁰⁶⁵¹ is an apocalyptic number.

620651 is a deficient number, since it is larger than the sum of its proper divisors (20053).

620651 is a wasteful number, since it uses less digits than its factorization.

620651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20052.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 620651 is about 787.8140643578. The cubic root of 620651 is about 85.3000239597.

Adding to 620651 its reverse (156026), we get a palindrome (776677).

The spelling of 620651 in words is "six hundred twenty thousand, six hundred fifty-one".