219664028 has 6 divisors (see below), whose sum is σ = 384412056. Its totient is φ = 109832012.

The previous prime is 219664001. The next prime is 219664031. The reversal of 219664028 is 820466912.

It is a junction number, because it is equal to n+sod(n) for n = 219663982 and 219664000.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27458000 + ... + 27458007.

It is an arithmetic number, because the mean of its divisors is an integer number (64068676).

Almost surely, 2^219664028 is an apocalyptic number.

It is an amenable number.

219664028 is a deficient number, since it is larger than the sum of its proper divisors (164748028).

219664028 is a wasteful number, since it uses less digits than its factorization.

219664028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54916011 (or 54916009 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 38.

The square root of 219664028 is about 14821.0670331120. The cubic root of 219664028 is about 603.3736141789.

The spelling of 219664028 in words is "two hundred nineteen million, six hundred sixty-four thousand, twenty-eight".