620657 has 2 divisors, whose sum is σ = 620658. Its totient is φ = 620656.

The previous prime is 620647. The next prime is 620663. The reversal of 620657 is 756026.

620657 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 541696 + 78961 = 736^2 + 281^2 .

It is a cyclic number.

It is not a de Polignac number, because 620657 - 2⁸ = 620401 is a prime.

It is a super-2 number, since 2×620657² = 770430223298, which contains 22 as substring.

It is a Chen prime.

It is a plaindrome in base 14.

It is not a weakly prime, because it can be changed into another prime (620647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310328 + 310329.

It is an arithmetic number, because the mean of its divisors is an integer number (310329).

2⁶²⁰⁶⁵⁷ is an apocalyptic number.

It is an amenable number.

620657 is a deficient number, since it is larger than the sum of its proper divisors (1).

620657 is an equidigital number, since it uses as much as digits as its factorization.

620657 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2520, while the sum is 26.

The square root of 620657 is about 787.8178723538. The cubic root of 620657 is about 85.3002988316.

The spelling of 620657 in words is "six hundred twenty thousand, six hundred fifty-seven".