620781 has 24 divisors (see below), whose sum is σ = 995904. Its totient is φ = 342720.

The previous prime is 620777. The next prime is 620813. The reversal of 620781 is 187026.

It is not a de Polignac number, because 620781 - 2² = 620777 is a prime.

It is a super-2 number, since 2×620781² = 770738099922, which contains 22 as substring.

It is a plaindrome in base 14.

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 620781.

It is not an unprimeable number, because it can be changed into a prime (620731) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5976 + ... + 6078.

It is an arithmetic number, because the mean of its divisors is an integer number (41496).

2⁶²⁰⁷⁸¹ is an apocalyptic number.

It is an amenable number.

620781 is a deficient number, since it is larger than the sum of its proper divisors (375123).

620781 is a wasteful number, since it uses less digits than its factorization.

620781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161 (or 154 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 24.

The square root of 620781 is about 787.8965668157. The cubic root of 620781 is about 85.3059791203.

The spelling of 620781 in words is "six hundred twenty thousand, seven hundred eighty-one".