1728885730 has 64 divisors (see below), whose sum is σ = 3670748928. Its totient is φ = 577992960.

The previous prime is 1728885709. The next prime is 1728885751. The reversal of 1728885730 is 375888271.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1728885709) and next prime (1728885751).

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 373792 + ... + 378388.

It is an arithmetic number, because the mean of its divisors is an integer number (57355452).

Almost surely, 2^1728885730 is an apocalyptic number.

1728885730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1728885730 is an abundant number, since it is smaller than the sum of its proper divisors (1941863198).

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

1728885730 is a wasteful number, since it uses less digits than its factorization.

1728885730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4891.

The product of its (nonzero) digits is 752640, while the sum is 49.

The square root of 1728885730 is about 41579.8716929237. The cubic root of 1728885730 is about 1200.2049950714.

The spelling of 1728885730 in words is "one billion, seven hundred twenty-eight million, eight hundred eighty-five thousand, seven hundred thirty".