642357773 has 4 divisors (see below), whose sum is σ = 643091100. Its totient is φ = 641624448.

The previous prime is 642357763. The next prime is 642357787. The reversal of 642357773 is 377753246.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 261210244 + 381147529 = 16162^2 + 19523^2 .

It is a cyclic number.

It is not a de Polignac number, because 642357773 - 2¹⁶ = 642292237 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642357713) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 365348 + ... + 367101.

It is an arithmetic number, because the mean of its divisors is an integer number (160772775).

Almost surely, 2^642357773 is an apocalyptic number.

It is an amenable number.

642357773 is a deficient number, since it is larger than the sum of its proper divisors (733327).

642357773 is an equidigital number, since it uses as much as digits as its factorization.

642357773 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 733326.

The product of its digits is 740880, while the sum is 44.

The square root of 642357773 is about 25344.7780223067. The cubic root of 642357773 is about 862.8308432651.

The spelling of 642357773 in words is "six hundred forty-two million, three hundred fifty-seven thousand, seven hundred seventy-three".