216702845 has 4 divisors (see below), whose sum is σ = 260043420. Its totient is φ = 173362272.

The previous prime is 216702839. The next prime is 216702851. The reversal of 216702845 is 548207612.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (216702839) and next prime (216702851).

It can be written as a sum of positive squares in 2 ways, for example, as 36445369 + 180257476 = 6037^2 + 13426^2 .

It is a cyclic number.

It is not a de Polignac number, because 216702845 - 2⁶ = 216702781 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21670280 + ... + 21670289.

It is an arithmetic number, because the mean of its divisors is an integer number (65010855).

Almost surely, 2^216702845 is an apocalyptic number.

It is an amenable number.

216702845 is a deficient number, since it is larger than the sum of its proper divisors (43340575).

216702845 is an equidigital number, since it uses as much as digits as its factorization.

216702845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43340574.

The product of its (nonzero) digits is 26880, while the sum is 35.

The square root of 216702845 is about 14720.8303094628. The cubic root of 216702845 is about 600.6500778178.

The spelling of 216702845 in words is "two hundred sixteen million, seven hundred two thousand, eight hundred forty-five".