642658727 has 2 divisors, whose sum is σ = 642658728. Its totient is φ = 642658726.

The previous prime is 642658699. The next prime is 642658733. The reversal of 642658727 is 727856246.

642658727 is digitally balanced in base 2, 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 642658727 - 2¹² = 642654631 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 (642658747) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321329363 + 321329364.

It is an arithmetic number, because the mean of its divisors is an integer number (321329364).

Almost surely, 2^642658727 is an apocalyptic number.

642658727 is a deficient number, since it is larger than the sum of its proper divisors (1).

642658727 is an equidigital number, since it uses as much as digits as its factorization.

642658727 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1128960, while the sum is 47.

The square root of 642658727 is about 25350.7145264192. The cubic root of 642658727 is about 862.9655718446.

The spelling of 642658727 in words is "six hundred forty-two million, six hundred fifty-eight thousand, seven hundred twenty-seven".