30865728 has 56 divisors (see below), whose sum is σ = 85973920. Its totient is φ = 9745920.

The previous prime is 30865711. The next prime is 30865753. The reversal of 30865728 is 82756803.

30865728 is nontrivially palindromic in base 5.

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 7 ways as a sum of consecutive naturals, for example, 583 + ... + 7878.

Almost surely, 2^30865728 is an apocalyptic number.

30865728 is a gapful number since it is divisible by the number (38) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 30865728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42986960).

30865728 is an abundant number, since it is smaller than the sum of its proper divisors (55108192).

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

30865728 is a wasteful number, since it uses less digits than its factorization.

30865728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8495 (or 8485 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 39.

The square root of 30865728 is about 5555.6932960703. The cubic root of 30865728 is about 313.6838610237.

The spelling of 30865728 in words is "thirty million, eight hundred sixty-five thousand, seven hundred twenty-eight".