642706 has 8 divisors (see below), whose sum is σ = 969264. Its totient is φ = 319620.

The previous prime is 642701. The next prime is 642737. The reversal of 642706 is 607246.

642706 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not an unprimeable number, because it can be changed into a prime (642701) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 340 + ... + 1183.

It is an arithmetic number, because the mean of its divisors is an integer number (121158).

2⁶⁴²⁷⁰⁶ is an apocalyptic number.

642706 is a deficient number, since it is larger than the sum of its proper divisors (326558).

642706 is a wasteful number, since it uses less digits than its factorization.

642706 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1736.

The product of its (nonzero) digits is 2016, while the sum is 25.

The square root of 642706 is about 801.6894660653. The cubic root of 642706 is about 86.2986730805.

The spelling of 642706 in words is "six hundred forty-two thousand, seven hundred six".