30436728 has 64 divisors (see below), whose sum is σ = 90754560. Its totient is φ = 8317056.

The previous prime is 30436723. The next prime is 30436729. The reversal of 30436728 is 82763403.

It is a super-2 number, since 2×30436728² = 1852788822691968, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30436723) 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 15 ways as a sum of consecutive naturals, for example, 75 + ... + 7802.

It is an arithmetic number, because the mean of its divisors is an integer number (1418040).

Almost surely, 2^30436728 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 30436728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45377280).

30436728 is an abundant number, since it is smaller than the sum of its proper divisors (60317832).

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

30436728 is a wasteful number, since it uses less digits than its factorization.

30436728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7916 (or 7912 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 33.

The square root of 30436728 is about 5516.9491569163. The cubic root of 30436728 is about 312.2237875066.

The spelling of 30436728 in words is "thirty million, four hundred thirty-six thousand, seven hundred twenty-eight".