642077 has 2 divisors, whose sum is σ = 642078. Its totient is φ = 642076.

The previous prime is 642071. The next prime is 642079. The reversal of 642077 is 770246.

642077 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 can be written as a sum of positive squares in only one way, i.e., 498436 + 143641 = 706^2 + 379^2 .

It is a cyclic number.

It is not a de Polignac number, because 642077 - 2⁶ = 642013 is a prime.

Together with 642079, 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 (642071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321038 + 321039.

It is an arithmetic number, because the mean of its divisors is an integer number (321039).

2⁶⁴²⁰⁷⁷ is an apocalyptic number.

It is an amenable number.

642077 is a deficient number, since it is larger than the sum of its proper divisors (1).

642077 is an equidigital number, since it uses as much as digits as its factorization.

642077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2352, while the sum is 26.

The square root of 642077 is about 801.2970735002. The cubic root of 642077 is about 86.2705111199.

The spelling of 642077 in words is "six hundred forty-two thousand, seventy-seven".