217557132 has 48 divisors (see below), whose sum is σ = 564329472. Its totient is φ = 64779840.

The previous prime is 217557083. The next prime is 217557139. The reversal of 217557132 is 231755712.

It is a happy number.

It is a super-2 number, since 2×217557132² = 94662211368130848, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 217557093 and 217557102.

It is not an unprimeable number, because it can be changed into a prime (217557139) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17658 + ... + 27329.

It is an arithmetic number, because the mean of its divisors is an integer number (11756864).

Almost surely, 2^217557132 is an apocalyptic number.

It is an amenable number.

217557132 is an abundant number, since it is smaller than the sum of its proper divisors (346772340).

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

217557132 is a wasteful number, since it uses less digits than its factorization.

217557132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45038 (or 45036 counting only the distinct ones).

The product of its digits is 14700, while the sum is 33.

The square root of 217557132 is about 14749.8180327759. The cubic root of 217557132 is about 601.4383381061.

The spelling of 217557132 in words is "two hundred seventeen million, five hundred fifty-seven thousand, one hundred thirty-two".