664158 has 32 divisors (see below), whose sum is σ = 1503360. Its totient is φ = 193760.

The previous prime is 664151. The next prime is 664177. The reversal of 664158 is 851466.

It is a super-2 number, since 2×664158² = 882211697928, which contains 22 as substring.

It is a Curzon 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 664158.

It is not an unprimeable number, because it can be changed into a prime (664151) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1741 + ... + 2087.

It is an arithmetic number, because the mean of its divisors is an integer number (46980).

2⁶⁶⁴¹⁵⁸ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 664158, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (751680).

664158 is an abundant number, since it is smaller than the sum of its proper divisors (839202).

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

664158 is a wasteful number, since it uses less digits than its factorization.

664158 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 392.

The product of its digits is 5760, while the sum is 30.

The square root of 664158 is about 814.9588946689. The cubic root of 664158 is about 87.2483326310.

Subtracting from 664158 its sum of digits (30), we obtain a triangular number (664128 = T₁₁₅₂).

It can be divided in two parts, 66 and 4158, that added together give a palindrome (4224).

The spelling of 664158 in words is "six hundred sixty-four thousand, one hundred fifty-eight".