30728514 has 8 divisors (see below), whose sum is σ = 61457040. Its totient is φ = 10242836.

The previous prime is 30728497. The next prime is 30728521. The reversal of 30728514 is 41582703.

It is a sphenic number, since it is the product of 3 distinct primes.

30728514 is an admirable number.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2560704 + ... + 2560715.

It is an arithmetic number, because the mean of its divisors is an integer number (7682130).

Almost surely, 2^30728514 is an apocalyptic number.

30728514 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

30728514 is a wasteful number, since it uses less digits than its factorization.

30728514 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5121424.

The product of its (nonzero) digits is 6720, while the sum is 30.

The square root of 30728514 is about 5543.3305872914. The cubic root of 30728514 is about 313.2183419396.

The spelling of 30728514 in words is "thirty million, seven hundred twenty-eight thousand, five hundred fourteen".