217367028 has 72 divisors (see below), whose sum is σ = 561523872. Its totient is φ = 70880832.

The previous prime is 217367027. The next prime is 217367069. The reversal of 217367028 is 820763712.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 217366983 and 217367001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (217367027) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 547326 + ... + 547722.

Almost surely, 2^217367028 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 217367028, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (280761936).

217367028 is an abundant number, since it is smaller than the sum of its proper divisors (344156844).

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

217367028 is a wasteful number, since it uses less digits than its factorization.

217367028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 701 (or 696 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 36.

The square root of 217367028 is about 14743.3723414964. The cubic root of 217367028 is about 601.2631057406.

The spelling of 217367028 in words is "two hundred seventeen million, three hundred sixty-seven thousand, twenty-eight".