217254878228 has 12 divisors (see below), whose sum is σ = 382713892512. Its totient is φ = 107908051800.

The previous prime is 217254878201. The next prime is 217254878231. The reversal of 217254878228 is 822878452712.

It is a super-2 number, since 2×217254878228² (a number of 23 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (56) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 179846150 + ... + 179847357.

It is an arithmetic number, because the mean of its divisors is an integer number (31892824376).

Almost surely, 2^217254878228 is an apocalyptic number.

It is an amenable number.

217254878228 is a deficient number, since it is larger than the sum of its proper divisors (165459014284).

217254878228 is a wasteful number, since it uses less digits than its factorization.

217254878228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 359693662 (or 359693660 counting only the distinct ones).

The product of its digits is 8028160, while the sum is 56.

The spelling of 217254878228 in words is "two hundred seventeen billion, two hundred fifty-four million, eight hundred seventy-eight thousand, two hundred twenty-eight".