217108772 has 12 divisors (see below), whose sum is σ = 382137756. Its totient is φ = 107926560.

The previous prime is 217108769. The next prime is 217108807. The reversal of 217108772 is 277801712.

217108772 is digitally balanced in base 3 and base 9, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 187580416 + 29528356 = 13696^2 + 5434^2 .

217108772 is strictly pandigital in base 9.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 156179 + ... + 157562.

It is an arithmetic number, because the mean of its divisors is an integer number (31844813).

Almost surely, 2^217108772 is an apocalyptic number.

It is an amenable number.

217108772 is a deficient number, since it is larger than the sum of its proper divisors (165028984).

217108772 is a wasteful number, since it uses less digits than its factorization.

217108772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 313918 (or 313916 counting only the distinct ones).

The product of its (nonzero) digits is 10976, while the sum is 35.

The square root of 217108772 is about 14734.6113623672. The cubic root of 217108772 is about 601.0248890812.

The spelling of 217108772 in words is "two hundred seventeen million, one hundred eight thousand, seven hundred seventy-two".