217913828 has 12 divisors (see below), whose sum is σ = 416017392. Its totient is φ = 99051720.

The previous prime is 217913827. The next prime is 217913851. The reversal of 217913828 is 828319712.

It is a super-2 number, since 2×217913828² = 94972872867227168, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (217913821) 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, 2476250 + ... + 2476337.

It is an arithmetic number, because the mean of its divisors is an integer number (34668116).

Almost surely, 2^217913828 is an apocalyptic number.

It is an amenable number.

217913828 is a deficient number, since it is larger than the sum of its proper divisors (198103564).

217913828 is a wasteful number, since it uses less digits than its factorization.

217913828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4952602 (or 4952600 counting only the distinct ones).

The product of its digits is 48384, while the sum is 41.

The square root of 217913828 is about 14761.9046196621. The cubic root of 217913828 is about 601.7668548954.

The spelling of 217913828 in words is "two hundred seventeen million, nine hundred thirteen thousand, eight hundred twenty-eight".