642747 has 16 divisors (see below), whose sum is σ = 991232. Its totient is φ = 362880.

The previous prime is 642739. The next prime is 642769. The reversal of 642747 is 747246.

642747 is digitally balanced in base 7, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 642747 - 2³ = 642739 is a prime.

It is a Duffinian number.

642747 is strictly pandigital in base 7.

It is not an unprimeable number, because it can be changed into a prime (642737) 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 15 ways as a sum of consecutive naturals, for example, 2547 + ... + 2787.

It is an arithmetic number, because the mean of its divisors is an integer number (61952).

2⁶⁴²⁷⁴⁷ is an apocalyptic number.

642747 is a deficient number, since it is larger than the sum of its proper divisors (348485).

642747 is a wasteful number, since it uses less digits than its factorization.

642747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 378.

The product of its digits is 9408, while the sum is 30.

The square root of 642747 is about 801.7150366558. The cubic root of 642747 is about 86.3005081188.

The spelling of 642747 in words is "six hundred forty-two thousand, seven hundred forty-seven".