642707 has 6 divisors (see below), whose sum is σ = 696132. Its totient is φ = 593112.

The previous prime is 642701. The next prime is 642737. The reversal of 642707 is 707246.

It is not a de Polignac number, because 642707 - 2¹⁴ = 626323 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 642707.

It is not an unprimeable number, because it can be changed into a prime (642701) 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 5 ways as a sum of consecutive naturals, for example, 1733 + ... + 2070.

It is an arithmetic number, because the mean of its divisors is an integer number (116022).

2⁶⁴²⁷⁰⁷ is an apocalyptic number.

642707 is a deficient number, since it is larger than the sum of its proper divisors (53425).

642707 is a wasteful number, since it uses less digits than its factorization.

642707 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3829 (or 3816 counting only the distinct ones).

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

The square root of 642707 is about 801.6900897479. The cubic root of 642707 is about 86.2987178384.

The spelling of 642707 in words is "six hundred forty-two thousand, seven hundred seven".