216442826 has 8 divisors (see below), whose sum is σ = 327643140. Its totient is φ = 107228448.

The previous prime is 216442819. The next prime is 216442841. The reversal of 216442826 is 628244612.

It can be written as a sum of positive squares in 2 ways, for example, as 172948801 + 43494025 = 13151^2 + 6595^2 .

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

It is a Curzon number.

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, 496211 + ... + 496646.

Almost surely, 2^216442826 is an apocalyptic number.

216442826 is a deficient number, since it is larger than the sum of its proper divisors (111200314).

216442826 is a wasteful number, since it uses less digits than its factorization.

216442826 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 992968.

The product of its digits is 36864, while the sum is 35.

The square root of 216442826 is about 14711.9959896678. The cubic root of 216442826 is about 600.4097441932.

The spelling of 216442826 in words is "two hundred sixteen million, four hundred forty-two thousand, eight hundred twenty-six".