19716228 has 54 divisors (see below), whose sum is σ = 57980286. Its totient is φ = 5632704.

The previous prime is 19716199. The next prime is 19716233. The reversal of 19716228 is 82261791.

It can be written as a sum of positive squares in only one way, i.e., 19079424 + 636804 = 4368^2 + 798^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 19716192 and 19716201.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 3825 + ... + 7352.

It is an arithmetic number, because the mean of its divisors is an integer number (1073709).

Almost surely, 2^19716228 is an apocalyptic number.

19716228 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

19716228 is an abundant number, since it is smaller than the sum of its proper divisors (38264058).

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

19716228 is a wasteful number, since it uses less digits than its factorization.

19716228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11201 (or 11189 counting only the distinct ones).

The product of its digits is 12096, while the sum is 36.

The square root of 19716228 is about 4440.2959360835. The cubic root of 19716228 is about 270.1518487402.

The spelling of 19716228 in words is "nineteen million, seven hundred sixteen thousand, two hundred twenty-eight".