65890 has 16 divisors (see below), whose sum is σ = 129600. Its totient is φ = 23920.

The previous prime is 65881. The next prime is 65899. The reversal of 65890 is 9856.

It is an interprime number because it is at equal distance from previous prime (65881) and next prime (65899).

It is an alternating number because its digits alternate between even and odd.

It is not an unprimeable number, because it can be changed into a prime (65899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 190 + ... + 409.

It is an arithmetic number, because the mean of its divisors is an integer number (8100).

2⁶⁵⁸⁹⁰ is an apocalyptic number.

65890 is a deficient number, since it is larger than the sum of its proper divisors (63710).

65890 is a wasteful number, since it uses less digits than its factorization.

65890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 617.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 65890 is about 256.6904750862. The cubic root of 65890 is about 40.3899363882.

The spelling of 65890 in words is "sixty-five thousand, eight hundred ninety".