642785311 has 8 divisors (see below), whose sum is σ = 741885984. Its totient is φ = 545503200.

The previous prime is 642785309. The next prime is 642785321. The reversal of 642785311 is 113587246.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 642785311 - 2¹ = 642785309 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642785321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 453880 + ... + 455293.

It is an arithmetic number, because the mean of its divisors is an integer number (92735748).

Almost surely, 2^642785311 is an apocalyptic number.

642785311 is a deficient number, since it is larger than the sum of its proper divisors (99100673).

642785311 is a wasteful number, since it uses less digits than its factorization.

642785311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 909281.

The product of its digits is 40320, while the sum is 37.

The square root of 642785311 is about 25353.2110589566. The cubic root of 642785311 is about 863.0222273487.

The spelling of 642785311 in words is "six hundred forty-two million, seven hundred eighty-five thousand, three hundred eleven".