30928725 has 36 divisors (see below), whose sum is σ = 55986372. Its totient is φ = 16320000.

The previous prime is 30928717. The next prime is 30928747. The reversal of 30928725 is 52782903.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 26244 + 30902481 = 162^2 + 5559^2 .

It is not a de Polignac number, because 30928725 - 2³ = 30928717 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 30928725.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 22045 + ... + 23405.

It is an arithmetic number, because the mean of its divisors is an integer number (1555177).

Almost surely, 2^30928725 is an apocalyptic number.

It is an amenable number.

30928725 is a deficient number, since it is larger than the sum of its proper divisors (25057647).

30928725 is a wasteful number, since it uses less digits than its factorization.

30928725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1478 (or 1470 counting only the distinct ones).

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

The square root of 30928725 is about 5561.3599955407. The cubic root of 30928725 is about 313.8971257515.

The spelling of 30928725 in words is "thirty million, nine hundred twenty-eight thousand, seven hundred twenty-five".