211728378 has 8 divisors (see below), whose sum is σ = 423456768. Its totient is φ = 70576124.

The previous prime is 211728371. The next prime is 211728443. The reversal of 211728378 is 873827112.

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

211728378 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (211728371) by changing a digit.

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, 17644026 + ... + 17644037.

It is an arithmetic number, because the mean of its divisors is an integer number (52932096).

Almost surely, 2^211728378 is an apocalyptic number.

211728378 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

211728378 is a wasteful number, since it uses less digits than its factorization.

211728378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35288068.

The product of its digits is 37632, while the sum is 39.

The square root of 211728378 is about 14550.8892511764. The cubic root of 211728378 is about 596.0184314075.

The spelling of 211728378 in words is "two hundred eleven million, seven hundred twenty-eight thousand, three hundred seventy-eight".