216779834 has 4 divisors (see below), whose sum is σ = 325169754. Its totient is φ = 108389916.

The previous prime is 216779831. The next prime is 216779867. The reversal of 216779834 is 438977612.

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

It can be written as a sum of positive squares in only one way, i.e., 171688609 + 45091225 = 13103^2 + 6715^2 .

It is not an unprimeable number, because it can be changed into a prime (216779831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54194957 + ... + 54194960.

Almost surely, 2^216779834 is an apocalyptic number.

216779834 is a deficient number, since it is larger than the sum of its proper divisors (108389920).

216779834 is a wasteful number, since it uses less digits than its factorization.

216779834 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108389919.

The product of its digits is 508032, while the sum is 47.

The square root of 216779834 is about 14723.4450452331. The cubic root of 216779834 is about 600.7212012857.

The spelling of 216779834 in words is "two hundred sixteen million, seven hundred seventy-nine thousand, eight hundred thirty-four".