664136 has 16 divisors (see below), whose sum is σ = 1358640. Its totient is φ = 301840.

The previous prime is 664133. The next prime is 664141. The reversal of 664136 is 631466.

It is an Ulam number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 664136.

It is not an unprimeable number, because it can be changed into a prime (664133) 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, 3686 + ... + 3861.

It is an arithmetic number, because the mean of its divisors is an integer number (84915).

2⁶⁶⁴¹³⁶ is an apocalyptic number.

It is an amenable number.

664136 is an abundant number, since it is smaller than the sum of its proper divisors (694504).

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

664136 is a wasteful number, since it uses less digits than its factorization.

664136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7564 (or 7560 counting only the distinct ones).

The product of its digits is 2592, while the sum is 26.

The square root of 664136 is about 814.9453969439. The cubic root of 664136 is about 87.2473692636.

The spelling of 664136 in words is "six hundred sixty-four thousand, one hundred thirty-six".