30728130 has 128 divisors (see below), whose sum is σ = 84049920. Its totient is φ = 7153920.

The previous prime is 30728123. The next prime is 30728171. The reversal of 30728130 is 3182703.

30728130 = T₄₉₂ + T₄₉₃ + ... + T₆₇₁.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 30728130.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 653767 + ... + 653813.

It is an arithmetic number, because the mean of its divisors is an integer number (656640).

Almost surely, 2^30728130 is an apocalyptic number.

30728130 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 30728130, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42024960).

30728130 is an abundant number, since it is smaller than the sum of its proper divisors (53321790).

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

30728130 is a wasteful number, since it uses less digits than its factorization.

30728130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144.

The product of its (nonzero) digits is 1008, while the sum is 24.

The square root of 30728130 is about 5543.2959509664. The cubic root of 30728130 is about 313.2170372194.

The spelling of 30728130 in words is "thirty million, seven hundred twenty-eight thousand, one hundred thirty".