217313628 has 36 divisors (see below), whose sum is σ = 589852872. Its totient is φ = 62089440.

The previous prime is 217313609. The next prime is 217313633. The reversal of 217313628 is 826313712.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 184203 + ... + 185378.

It is an arithmetic number, because the mean of its divisors is an integer number (16384802).

Almost surely, 2^217313628 is an apocalyptic number.

217313628 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

217313628 is an abundant number, since it is smaller than the sum of its proper divisors (372539244).

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

217313628 is a wasteful number, since it uses less digits than its factorization.

217313628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 369602 (or 369593 counting only the distinct ones).

The product of its digits is 12096, while the sum is 33.

The square root of 217313628 is about 14741.5612470321. The cubic root of 217313628 is about 601.2138647866.

The spelling of 217313628 in words is "two hundred seventeen million, three hundred thirteen thousand, six hundred twenty-eight".