217079516 has 12 divisors (see below), whose sum is σ = 385093632. Its totient is φ = 107052768.

The previous prime is 217079507. The next prime is 217079519. The reversal of 217079516 is 615970712.

It is a self number, because there is not a number n which added to its sum of digits gives 217079516.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (217079519) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 371420 + ... + 372003.

It is an arithmetic number, because the mean of its divisors is an integer number (32091136).

Almost surely, 2^217079516 is an apocalyptic number.

It is an amenable number.

217079516 is a deficient number, since it is larger than the sum of its proper divisors (168014116).

217079516 is a wasteful number, since it uses less digits than its factorization.

217079516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 743500 (or 743498 counting only the distinct ones).

The product of its (nonzero) digits is 26460, while the sum is 38.

The square root of 217079516 is about 14733.6185643582. The cubic root of 217079516 is about 600.9978912867.

The spelling of 217079516 in words is "two hundred seventeen million, seventy-nine thousand, five hundred sixteen".