1720268728 has 8 divisors (see below), whose sum is σ = 3225503880. Its totient is φ = 860134360.

The previous prime is 1720268689. The next prime is 1720268741. The reversal of 1720268728 is 8278620271.

It is a tau number, because it is divible by the number of its divisors (8).

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, 107516788 + ... + 107516803.

It is an arithmetic number, because the mean of its divisors is an integer number (403187985).

Almost surely, 2^1720268728 is an apocalyptic number.

It is an amenable number.

1720268728 is a deficient number, since it is larger than the sum of its proper divisors (1505235152).

1720268728 is a wasteful number, since it uses less digits than its factorization.

1720268728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215033597 (or 215033593 counting only the distinct ones).

The product of its (nonzero) digits is 150528, while the sum is 43.

The square root of 1720268728 is about 41476.1223838488. The cubic root of 1720268728 is about 1198.2076780214.

Adding to 1720268728 its reverse (8278620271), we get a palindrome (9998888999).

The spelling of 1720268728 in words is "one billion, seven hundred twenty million, two hundred sixty-eight thousand, seven hundred twenty-eight".