65990 has 8 divisors (see below), whose sum is σ = 118800. Its totient is φ = 26392.

The previous prime is 65983. The next prime is 65993. The reversal of 65990 is 9956.

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 (65993) by changing a digit.

65990 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3290 + ... + 3309.

It is an arithmetic number, because the mean of its divisors is an integer number (14850).

2⁶⁵⁹⁹⁰ is an apocalyptic number.

65990 is a deficient number, since it is larger than the sum of its proper divisors (52810).

65990 is a wasteful number, since it uses less digits than its factorization.

65990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6606.

The product of its (nonzero) digits is 2430, while the sum is 29.

The square root of 65990 is about 256.8851883624. The cubic root of 65990 is about 40.4103590728.

The spelling of 65990 in words is "sixty-five thousand, nine hundred ninety".