217629028 has 12 divisors (see below), whose sum is σ = 381136252. Its totient is φ = 108732960.

The previous prime is 217629023. The next prime is 217629037. The reversal of 217629028 is 820926712.

It can be written as a sum of positive squares in 2 ways, for example, as 129231424 + 88397604 = 11368^2 + 9402^2 .

It is not an unprimeable number, because it can be changed into a prime (217629023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14175 + ... + 25222.

Almost surely, 2^217629028 is an apocalyptic number.

It is an amenable number.

217629028 is a deficient number, since it is larger than the sum of its proper divisors (163507224).

217629028 is a wasteful number, since it uses less digits than its factorization.

217629028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40782 (or 40780 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 217629028 is about 14752.2550140648. The cubic root of 217629028 is about 601.5045831547.

The spelling of 217629028 in words is "two hundred seventeen million, six hundred twenty-nine thousand, twenty-eight".