620257667 has 2 divisors, whose sum is σ = 620257668. Its totient is φ = 620257666.

The previous prime is 620257661. The next prime is 620257669. The reversal of 620257667 is 766752026.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 620257667 - 2²⁶ = 553148803 is a prime.

Together with 620257669, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (620257661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310128833 + 310128834.

It is an arithmetic number, because the mean of its divisors is an integer number (310128834).

Almost surely, 2^620257667 is an apocalyptic number.

620257667 is a deficient number, since it is larger than the sum of its proper divisors (1).

620257667 is an equidigital number, since it uses as much as digits as its factorization.

620257667 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 211680, while the sum is 41.

The square root of 620257667 is about 24904.9727363834. The cubic root of 620257667 is about 852.8200073121.

The spelling of 620257667 in words is "six hundred twenty million, two hundred fifty-seven thousand, six hundred sixty-seven".