217026980 has 12 divisors (see below), whose sum is σ = 455756700. Its totient is φ = 86810784.

The previous prime is 217026973. The next prime is 217027037. The reversal of 217026980 is 89620712.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 124367104 + 92659876 = 11152^2 + 9626^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 217026980.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5425655 + ... + 5425694.

It is an arithmetic number, because the mean of its divisors is an integer number (37979725).

Almost surely, 2^217026980 is an apocalyptic number.

217026980 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

217026980 is an abundant number, since it is smaller than the sum of its proper divisors (238729720).

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

217026980 is a wasteful number, since it uses less digits than its factorization.

217026980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10851358 (or 10851356 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 217026980 is about 14731.8355950642. The cubic root of 217026980 is about 600.9494043341.

It can be divided in two parts, 21702 and 6980, that added together give a palindrome (28682).

The spelling of 217026980 in words is "two hundred seventeen million, twenty-six thousand, nine hundred eighty".