667542 has 16 divisors (see below), whose sum is σ = 1354752. Its totient is φ = 219240.

The previous prime is 667531. The next prime is 667547. The reversal of 667542 is 245766.

It is a super-2 number, since 2×667542² = 891224643528, which contains 22 as substring.

It is a d-powerful number, because it can be written as 6⁵ + 6⁷ + 5 + 7⁶ + 4⁹ + 2⁵ .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667547) by changing a digit.

667542 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 358 + ... + 1209.

It is an arithmetic number, because the mean of its divisors is an integer number (84672).

2⁶⁶⁷⁵⁴² is an apocalyptic number.

667542 is an abundant number, since it is smaller than the sum of its proper divisors (687210).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

667542 is a wasteful number, since it uses less digits than its factorization.

667542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1643.

The product of its digits is 10080, while the sum is 30.

The square root of 667542 is about 817.0324350967. The cubic root of 667542 is about 87.3962634572.

The spelling of 667542 in words is "six hundred sixty-seven thousand, five hundred forty-two".