216590 has 24 divisors (see below), whose sum is σ = 430920. Its totient is φ = 78320.

The previous prime is 216577. The next prime is 216607. The reversal of 216590 is 95612.

216590 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×216590² = 93822456200, which contains 22 as substring.

It is a plaindrome in base 13.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1121 + ... + 1299.

It is an arithmetic number, because the mean of its divisors is an integer number (17955).

2²¹⁶⁵⁹⁰ is an apocalyptic number.

216590 is a deficient number, since it is larger than the sum of its proper divisors (214330).

216590 is a wasteful number, since it uses less digits than its factorization.

216590 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208 (or 197 counting only the distinct ones).

The product of its (nonzero) digits is 540, while the sum is 23.

The square root of 216590 is about 465.3923076287. The cubic root of 216590 is about 60.0545799650.

The spelling of 216590 in words is "two hundred sixteen thousand, five hundred ninety".