19664272 has 20 divisors (see below), whose sum is σ = 38820060. Its totient is φ = 9646208.

The previous prime is 19664269. The next prime is 19664273. The reversal of 19664272 is 27246691.

It can be written as a sum of positive squares in 2 ways, for example, as 12503296 + 7160976 = 3536^2 + 2676^2 .

It is not an unprimeable number, because it can be changed into a prime (19664273) 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, 10747 + ... + 12442.

It is an arithmetic number, because the mean of its divisors is an integer number (1941003).

Almost surely, 2^19664272 is an apocalyptic number.

It is an amenable number.

19664272 is a deficient number, since it is larger than the sum of its proper divisors (19155788).

19664272 is a wasteful number, since it uses less digits than its factorization.

19664272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23250 (or 23244 counting only the distinct ones).

The product of its digits is 36288, while the sum is 37.

The square root of 19664272 is about 4434.4415657442. The cubic root of 19664272 is about 269.9143395385.

The spelling of 19664272 in words is "nineteen million, six hundred sixty-four thousand, two hundred seventy-two".