30758728 has 128 divisors (see below), whose sum is σ = 81285120. Its totient is φ = 10517760.

The previous prime is 30758723. The next prime is 30758743. The reversal of 30758728 is 82785703.

It is a super-3 number, since 3×30758728³ (a number of 23 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (30758723) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 184101 + ... + 184267.

It is an arithmetic number, because the mean of its divisors is an integer number (635040).

Almost surely, 2^30758728 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 30758728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40642560).

30758728 is an abundant number, since it is smaller than the sum of its proper divisors (50526392).

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

30758728 is a wasteful number, since it uses less digits than its factorization.

30758728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227 (or 223 counting only the distinct ones).

The product of its (nonzero) digits is 94080, while the sum is 40.

The square root of 30758728 is about 5546.0551746264. The cubic root of 30758728 is about 313.3209662641.

It can be divided in two parts, 30758 and 728, that multiplied together give a square (22391824 = 4732²).

The spelling of 30758728 in words is "thirty million, seven hundred fifty-eight thousand, seven hundred twenty-eight".