642069 has 6 divisors (see below), whose sum is σ = 927446. Its totient is φ = 428040.

The previous prime is 642049. The next prime is 642071. The reversal of 642069 is 960246.

It can be written as a sum of positive squares in only one way, i.e., 439569 + 202500 = 663^2 + 450^2 .

It is not a de Polignac number, because 642069 - 2⁸ = 641813 is a prime.

It is a super-2 number, since 2×642069² = 824505201522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 642069.

It is not an unprimeable number, because it can be changed into a prime (642049) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 35662 + ... + 35679.

2⁶⁴²⁰⁶⁹ is an apocalyptic number.

It is an amenable number.

642069 is a deficient number, since it is larger than the sum of its proper divisors (285377).

642069 is a wasteful number, since it uses less digits than its factorization.

642069 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71347 (or 71344 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 642069 is about 801.2920815782. The cubic root of 642069 is about 86.2701528207.

The spelling of 642069 in words is "six hundred forty-two thousand, sixty-nine".