620664767 has 2 divisors, whose sum is σ = 620664768. Its totient is φ = 620664766.

The previous prime is 620664763. The next prime is 620664853. The reversal of 620664767 is 767466026.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 620664767 - 2² = 620664763 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (620664763) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310332383 + 310332384.

It is an arithmetic number, because the mean of its divisors is an integer number (310332384).

Almost surely, 2^620664767 is an apocalyptic number.

620664767 is a deficient number, since it is larger than the sum of its proper divisors (1).

620664767 is an equidigital number, since it uses as much as digits as its factorization.

620664767 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 508032, while the sum is 44.

The square root of 620664767 is about 24913.1444623115. The cubic root of 620664767 is about 853.0065465061.

The spelling of 620664767 in words is "six hundred twenty million, six hundred sixty-four thousand, seven hundred sixty-seven".