30925728 has 72 divisors (see below), whose sum is σ = 88609248. Its totient is φ = 10230912.

The previous prime is 30925723. The next prime is 30925733. The reversal of 30925728 is 82752903.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (30925723) and next prime (30925733).

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 30925692 and 30925701.

It is not an unprimeable number, because it can be changed into a prime (30925723) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 47775 + ... + 48417.

It is an arithmetic number, because the mean of its divisors is an integer number (1230684).

Almost surely, 2^30925728 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 30925728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44304624).

30925728 is an abundant number, since it is smaller than the sum of its proper divisors (57683520).

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

30925728 is a wasteful number, since it uses less digits than its factorization.

30925728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 826 (or 815 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

The square root of 30925728 is about 5561.0905405325. The cubic root of 30925728 is about 313.8869865247.

The spelling of 30925728 in words is "thirty million, nine hundred twenty-five thousand, seven hundred twenty-eight".