664142 has 8 divisors (see below), whose sum is σ = 1003800. Its totient is φ = 329544.

The previous prime is 664141. The next prime is 664151. The reversal of 664142 is 241466.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664141) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 917 + ... + 1472.

It is an arithmetic number, because the mean of its divisors is an integer number (125475).

2⁶⁶⁴¹⁴² is an apocalyptic number.

664142 is a deficient number, since it is larger than the sum of its proper divisors (339658).

664142 is a wasteful number, since it uses less digits than its factorization.

664142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2530.

The product of its digits is 1152, while the sum is 23.

The square root of 664142 is about 814.9490781638. The cubic root of 664142 is about 87.2476320022.

It can be divided in two parts, 66 and 4142, that multiplied together give a palindrome (273372).

The spelling of 664142 in words is "six hundred sixty-four thousand, one hundred forty-two".