217608745628 has 24 divisors (see below), whose sum is σ = 385701354192. Its totient is φ = 107410385664.

The previous prime is 217608745609. The next prime is 217608745639. The reversal of 217608745628 is 826547806712.

It is a super-2 number, since 2×217608745628² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 177926 + ... + 683282.

It is an arithmetic number, because the mean of its divisors is an integer number (16070889758).

Almost surely, 2^217608745628 is an apocalyptic number.

It is an amenable number.

217608745628 is a deficient number, since it is larger than the sum of its proper divisors (168092608564).

217608745628 is a wasteful number, since it uses less digits than its factorization.

217608745628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 506741 (or 506739 counting only the distinct ones).

The product of its (nonzero) digits is 9031680, while the sum is 56.

The spelling of 217608745628 in words is "two hundred seventeen billion, six hundred eight million, seven hundred forty-five thousand, six hundred twenty-eight".