6420767 has 2 divisors, whose sum is σ = 6420768. Its totient is φ = 6420766.

The previous prime is 6420763. The next prime is 6420769. The reversal of 6420767 is 7670246.

It is a happy number.

6420767 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6420767 - 2² = 6420763 is a prime.

Together with 6420769, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6420763) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3210383 + 3210384.

It is an arithmetic number, because the mean of its divisors is an integer number (3210384).

Almost surely, 2^6420767 is an apocalyptic number.

6420767 is a deficient number, since it is larger than the sum of its proper divisors (1).

6420767 is an equidigital number, since it uses as much as digits as its factorization.

6420767 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14112, while the sum is 32.

The square root of 6420767 is about 2533.9232427207. The cubic root of 6420767 is about 185.8641529362.

The spelling of 6420767 in words is "six million, four hundred twenty thousand, seven hundred sixty-seven".