65994 has 16 divisors (see below), whose sum is σ = 139968. Its totient is φ = 20672.

The previous prime is 65993. The next prime is 66029. The reversal of 65994 is 49956.

It is a happy number.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (65993) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 222 + ... + 425.

It is an arithmetic number, because the mean of its divisors is an integer number (8748).

2⁶⁵⁹⁹⁴ is an apocalyptic number.

65994 is an abundant number, since it is smaller than the sum of its proper divisors (73974).

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

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (69984).

65994 is a wasteful number, since it uses less digits than its factorization.

65994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 669.

The product of its digits is 9720, while the sum is 33.

The square root of 65994 is about 256.8929738237. The cubic root of 65994 is about 40.4111755509.

The spelling of 65994 in words is "sixty-five thousand, nine hundred ninety-four".