642795 has 8 divisors (see below), whose sum is σ = 1028496. Its totient is φ = 342816.

The previous prime is 642791. The next prime is 642797. The reversal of 642795 is 597246.

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

It is not a de Polignac number, because 642795 - 2² = 642791 is a prime.

It is a d-powerful number, because it can be written as 6 + 4⁷ + 7⁵ + 2⁵ + 9⁶ + 5⁷ .

642795 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (642791) 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 7 ways as a sum of consecutive naturals, for example, 21412 + ... + 21441.

It is an arithmetic number, because the mean of its divisors is an integer number (128562).

2⁶⁴²⁷⁹⁵ is an apocalyptic number.

642795 is a deficient number, since it is larger than the sum of its proper divisors (385701).

642795 is a wasteful number, since it uses less digits than its factorization.

642795 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42861.

The product of its digits is 15120, while the sum is 33.

The square root of 642795 is about 801.7449719206. The cubic root of 642795 is about 86.3026563571.

The spelling of 642795 in words is "six hundred forty-two thousand, seven hundred ninety-five".