217047090 has 64 divisors (see below), whose sum is σ = 585398016. Its totient is φ = 51101952.

The previous prime is 217047079. The next prime is 217047091. The reversal of 217047090 is 90740712.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (217047091) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3129 + ... + 21068.

It is an arithmetic number, because the mean of its divisors is an integer number (9146844).

Almost surely, 2^217047090 is an apocalyptic number.

217047090 is an abundant number, since it is smaller than the sum of its proper divisors (368350926).

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

217047090 is a wasteful number, since it uses less digits than its factorization.

217047090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24243.

The product of its (nonzero) digits is 3528, while the sum is 30.

The square root of 217047090 is about 14732.5181147012. The cubic root of 217047090 is about 600.9679653432.

The spelling of 217047090 in words is "two hundred seventeen million, forty-seven thousand, ninety".