642364727 has 2 divisors, whose sum is σ = 642364728. Its totient is φ = 642364726.

The previous prime is 642364693. The next prime is 642364757. The reversal of 642364727 is 727463246.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 642364727 - 2⁶ = 642364663 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 (642364757) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321182363 + 321182364.

It is an arithmetic number, because the mean of its divisors is an integer number (321182364).

Almost surely, 2^642364727 is an apocalyptic number.

642364727 is a deficient number, since it is larger than the sum of its proper divisors (1).

642364727 is an equidigital number, since it uses as much as digits as its factorization.

642364727 is an evil number, because the sum of its binary digits is even.

The product of its digits is 338688, while the sum is 41.

The square root of 642364727 is about 25344.9152099588. The cubic root of 642364727 is about 862.8339568488.

The spelling of 642364727 in words is "six hundred forty-two million, three hundred sixty-four thousand, seven hundred twenty-seven".