642873 has 32 divisors (see below), whose sum is σ = 1124352. Its totient is φ = 319440.

The previous prime is 642871. The next prime is 642877. The reversal of 642873 is 378246.

642873 is nontrivially palindromic in base 2.

It is not a de Polignac number, because 642873 - 2¹ = 642871 is a prime.

It is a Curzon number.

It is a nialpdrome in base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 642873.

It is not an unprimeable number, because it can be changed into a prime (642871) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 27940 + ... + 27962.

It is an arithmetic number, because the mean of its divisors is an integer number (35136).

2⁶⁴²⁸⁷³ is an apocalyptic number.

It is an amenable number.

642873 is a deficient number, since it is larger than the sum of its proper divisors (481479).

642873 is a wasteful number, since it uses less digits than its factorization.

642873 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66 (or 44 counting only the distinct ones).

The product of its digits is 8064, while the sum is 30.

The square root of 642873 is about 801.7936143422. The cubic root of 642873 is about 86.3061470164.

The spelling of 642873 in words is "six hundred forty-two thousand, eight hundred seventy-three".