216853634 has 8 divisors (see below), whose sum is σ = 331417980. Its totient is φ = 106380976.

The previous prime is 216853627. The next prime is 216853639. The reversal of 216853634 is 436358612.

216853634 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 2 ways, for example, as 209815225 + 7038409 = 14485^2 + 2653^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (216853639) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1022789 + ... + 1023000.

Almost surely, 2^216853634 is an apocalyptic number.

216853634 is a deficient number, since it is larger than the sum of its proper divisors (114564346).

216853634 is a wasteful number, since it uses less digits than its factorization.

216853634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2045844.

The product of its digits is 103680, while the sum is 38.

The square root of 216853634 is about 14725.9510388973. The cubic root of 216853634 is about 600.7893629068.

The spelling of 216853634 in words is "two hundred sixteen million, eight hundred fifty-three thousand, six hundred thirty-four".