217028764 has 6 divisors (see below), whose sum is σ = 379800344. Its totient is φ = 108514380.

The previous prime is 217028743. The next prime is 217028767. The reversal of 217028764 is 467820712.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (217028767) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27128592 + ... + 27128599.

Almost surely, 2^217028764 is an apocalyptic number.

It is an amenable number.

217028764 is a deficient number, since it is larger than the sum of its proper divisors (162771580).

217028764 is a wasteful number, since it uses less digits than its factorization.

217028764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54257195 (or 54257193 counting only the distinct ones).

The product of its (nonzero) digits is 37632, while the sum is 37.

The square root of 217028764 is about 14731.8961440814. The cubic root of 217028764 is about 600.9510509662.

The spelling of 217028764 in words is "two hundred seventeen million, twenty-eight thousand, seven hundred sixty-four".