1728403280 has 40 divisors (see below), whose sum is σ = 4084426824. Its totient is φ = 680025600.

The previous prime is 1728403253. The next prime is 1728403283. The reversal of 1728403280 is 823048271.

It can be written as a sum of positive squares in 4 ways, for example, as 145636624 + 1582766656 = 12068^2 + 39784^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a self number, because there is not a number n which added to its sum of digits gives 1728403280.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1728403283) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 172211 + ... + 181970.

Almost surely, 2^1728403280 is an apocalyptic number.

1728403280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1728403280 is an abundant number, since it is smaller than the sum of its proper divisors (2356023544).

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

1728403280 is a wasteful number, since it uses less digits than its factorization.

1728403280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 354255 (or 354249 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 35.

The square root of 1728403280 is about 41574.0698031838. The cubic root of 1728403280 is about 1200.0933445907.

The spelling of 1728403280 in words is "one billion, seven hundred twenty-eight million, four hundred three thousand, two hundred eighty".