728194219 has 4 divisors (see below), whose sum is σ = 728420920. Its totient is φ = 727967520.

The previous prime is 728194213. The next prime is 728194253. The reversal of 728194219 is 912491827.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 728194219 - 2⁷ = 728194091 is a prime.

It is a super-2 number, since 2×728194219² = 1060533641170039922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (728194213) 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, 108462 + ... + 114979.

It is an arithmetic number, because the mean of its divisors is an integer number (182105230).

Almost surely, 2^728194219 is an apocalyptic number.

728194219 is a deficient number, since it is larger than the sum of its proper divisors (226701).

728194219 is a wasteful number, since it uses less digits than its factorization.

728194219 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226700.

The product of its digits is 72576, while the sum is 43.

The square root of 728194219 is about 26985.0740039749. The cubic root of 728194219 is about 899.6682806315.

The spelling of 728194219 in words is "seven hundred twenty-eight million, one hundred ninety-four thousand, two hundred nineteen".