216782078 has 4 divisors (see below), whose sum is σ = 325173120. Its totient is φ = 108391038.

The previous prime is 216782053. The next prime is 216782119. The reversal of 216782078 is 870287612.

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

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 as a sum of consecutive naturals, namely, 54195518 + ... + 54195521.

It is an arithmetic number, because the mean of its divisors is an integer number (81293280).

Almost surely, 2^216782078 is an apocalyptic number.

216782078 is a deficient number, since it is larger than the sum of its proper divisors (108391042).

216782078 is a wasteful number, since it uses less digits than its factorization.

216782078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108391041.

The product of its (nonzero) digits is 75264, while the sum is 41.

The square root of 216782078 is about 14723.5212500271. The cubic root of 216782078 is about 600.7232740703.

The spelling of 216782078 in words is "two hundred sixteen million, seven hundred eighty-two thousand, seventy-eight".