218728894 has 8 divisors (see below), whose sum is σ = 328877640. Its totient is φ = 109103016.

The previous prime is 218728847. The next prime is 218728897. The reversal of 218728894 is 498827812.

218728894 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218728897) 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, 129669 + ... + 131344.

It is an arithmetic number, because the mean of its divisors is an integer number (41109705).

Almost surely, 2^218728894 is an apocalyptic number.

218728894 is a deficient number, since it is larger than the sum of its proper divisors (110148746).

218728894 is a wasteful number, since it uses less digits than its factorization.

218728894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 261434.

The product of its digits is 516096, while the sum is 49.

The square root of 218728894 is about 14789.4859275094. The cubic root of 218728894 is about 602.5161869586.

The spelling of 218728894 in words is "two hundred eighteen million, seven hundred twenty-eight thousand, eight hundred ninety-four".