642727 has 8 divisors (see below), whose sum is σ = 684000. Its totient is φ = 602784.

The previous prime is 642701. The next prime is 642737. The reversal of 642727 is 727246.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-642727 is a prime.

It is a Duffinian number.

642727 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 642695 and 642704.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642737) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 774 + ... + 1372.

It is an arithmetic number, because the mean of its divisors is an integer number (85500).

2⁶⁴²⁷²⁷ is an apocalyptic number.

642727 is a deficient number, since it is larger than the sum of its proper divisors (41273).

642727 is a wasteful number, since it uses less digits than its factorization.

642727 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 665.

The product of its digits is 4704, while the sum is 28.

The square root of 642727 is about 801.7025632989. The cubic root of 642727 is about 86.2996129879.

It can be divided in two parts, 642 and 727, that added together give a square (1369 = 37²).

The spelling of 642727 in words is "six hundred forty-two thousand, seven hundred twenty-seven".