65490 has 32 divisors (see below), whose sum is σ = 164160. Its totient is φ = 16704.

The previous prime is 65479. The next prime is 65497. The reversal of 65490 is 9456.

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

It is a Curzon number.

It is a nialpdrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 65490.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65497) 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, 1081 + ... + 1139.

It is an arithmetic number, because the mean of its divisors is an integer number (5130).

2⁶⁵⁴⁹⁰ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 65490, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82080).

65490 is an abundant number, since it is smaller than the sum of its proper divisors (98670).

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

65490 is a wasteful number, since it uses less digits than its factorization.

65490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106.

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 65490 is about 255.9101404790. The cubic root of 65490 is about 40.3080383861.

It can be divided in two parts, 65 and 490, that added together give a palindrome (555).

The spelling of 65490 in words is "sixty-five thousand, four hundred ninety".