217261260 has 144 divisors (see below), whose sum is σ = 685706112. Its totient is φ = 55641600.

The previous prime is 217261249. The next prime is 217261283. The reversal of 217261260 is 62162712.

217261260 = 1201² + 1202² + ... + 1335².

217261260 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 515850 + ... + 516270.

It is an arithmetic number, because the mean of its divisors is an integer number (4761848).

Almost surely, 2^217261260 is an apocalyptic number.

217261260 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 217261260, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (342853056).

217261260 is an abundant number, since it is smaller than the sum of its proper divisors (468444852).

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

217261260 is a wasteful number, since it uses less digits than its factorization.

217261260 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 544 (or 539 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 217261260 is about 14739.7849373727. The cubic root of 217261260 is about 601.1655676207.

The spelling of 217261260 in words is "two hundred seventeen million, two hundred sixty-one thousand, two hundred sixty".