30728550 has 24 divisors (see below), whose sum is σ = 76207176. Its totient is φ = 8194240.

The previous prime is 30728549. The next prime is 30728569. The reversal of 30728550 is 5582703.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 102279 + ... + 102578.

It is an arithmetic number, because the mean of its divisors is an integer number (3175299).

Almost surely, 2^30728550 is an apocalyptic number.

30728550 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

30728550 is an abundant number, since it is smaller than the sum of its proper divisors (45478626).

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

30728550 is a wasteful number, since it uses less digits than its factorization.

30728550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204872 (or 204867 counting only the distinct ones).

The product of its (nonzero) digits is 8400, while the sum is 30.

The square root of 30728550 is about 5543.3338344357. Note that the first 3 decimals coincide. The cubic root of 30728550 is about 313.2184642566.

The spelling of 30728550 in words is "thirty million, seven hundred twenty-eight thousand, five hundred fifty".