217010028 has 12 divisors (see below), whose sum is σ = 506356760. Its totient is φ = 72336672.

The previous prime is 217010021. The next prime is 217010051. The reversal of 217010028 is 820010712.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 217009986 and 217010013.

It is not an unprimeable number, because it can be changed into a prime (217010021) 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, 9042073 + ... + 9042096.

Almost surely, 2^217010028 is an apocalyptic number.

It is an amenable number.

217010028 is an abundant number, since it is smaller than the sum of its proper divisors (289346732).

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

217010028 is a wasteful number, since it uses less digits than its factorization.

217010028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18084176 (or 18084174 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 21.

The square root of 217010028 is about 14731.2602312226. The cubic root of 217010028 is about 600.9337571865.

The spelling of 217010028 in words is "two hundred seventeen million, ten thousand, twenty-eight".