620644567 has 2 divisors, whose sum is σ = 620644568. Its totient is φ = 620644566.

The previous prime is 620644553. The next prime is 620644571. The reversal of 620644567 is 765446026.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-620644567 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (620644597) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310322283 + 310322284.

It is an arithmetic number, because the mean of its divisors is an integer number (310322284).

Almost surely, 2^620644567 is an apocalyptic number.

620644567 is a deficient number, since it is larger than the sum of its proper divisors (1).

620644567 is an equidigital number, since it uses as much as digits as its factorization.

620644567 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 241920, while the sum is 40.

The square root of 620644567 is about 24912.7390505340. The cubic root of 620644567 is about 852.9972924933.

The spelling of 620644567 in words is "six hundred twenty million, six hundred forty-four thousand, five hundred sixty-seven".