217070705 has 16 divisors (see below), whose sum is σ = 276189264. Its totient is φ = 163215360.

The previous prime is 217070677. The next prime is 217070719. The reversal of 217070705 is 507070712.

217070705 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 84198976 + 132871729 = 9176^2 + 11527^2 .

It is not a de Polignac number, because 217070705 - 2⁸ = 217070449 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 84845 + ... + 87365.

It is an arithmetic number, because the mean of its divisors is an integer number (17261829).

Almost surely, 2^217070705 is an apocalyptic number.

It is an amenable number.

217070705 is a deficient number, since it is larger than the sum of its proper divisors (59118559).

217070705 is a wasteful number, since it uses less digits than its factorization.

217070705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3556.

The product of its (nonzero) digits is 3430, while the sum is 29.

The square root of 217070705 is about 14733.3195512756. The cubic root of 217070705 is about 600.9897599129.

The spelling of 217070705 in words is "two hundred seventeen million, seventy thousand, seven hundred five".