620681 has 4 divisors (see below), whose sum is σ = 624000. Its totient is φ = 617364.

The previous prime is 620671. The next prime is 620689. The reversal of 620681 is 186026.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 620681 - 2¹⁰ = 619657 is a prime.

It is a super-3 number, since 3×620681³ = 717342576333843723, which contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

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 620681.

It is not an unprimeable number, because it can be changed into a prime (620689) 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, 1361 + ... + 1758.

It is an arithmetic number, because the mean of its divisors is an integer number (156000).

2⁶²⁰⁶⁸¹ is an apocalyptic number.

It is an amenable number.

620681 is a deficient number, since it is larger than the sum of its proper divisors (3319).

620681 is a wasteful number, since it uses less digits than its factorization.

620681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3318.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 620681 is about 787.8331041534. The cubic root of 620681 is about 85.3013983014.

The spelling of 620681 in words is "six hundred twenty thousand, six hundred eighty-one".