217028977616 has 40 divisors (see below), whose sum is σ = 485703895104. Its totient is φ = 92846620160.

The previous prime is 217028977567. The next prime is 217028977619. The reversal of 217028977616 is 616779820712.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (217028977619) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36265220 + ... + 36271203.

Almost surely, 2^217028977616 is an apocalyptic number.

It is an amenable number.

217028977616 is an abundant number, since it is smaller than the sum of its proper divisors (268674917488).

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

217028977616 is a wasteful number, since it uses less digits than its factorization.

217028977616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72536459 (or 72536453 counting only the distinct ones).

The product of its (nonzero) digits is 3556224, while the sum is 56.

The spelling of 217028977616 in words is "two hundred seventeen billion, twenty-eight million, nine hundred seventy-seven thousand, six hundred sixteen".