30213928 has 16 divisors (see below), whose sum is σ = 57172500. Its totient is φ = 14967936.

The previous prime is 30213901. The next prime is 30213949. The reversal of 30213928 is 82931203.

It can be written as a sum of positive squares in 2 ways, for example, as 30052324 + 161604 = 5482^2 + 402^2 .

It is a junction number, because it is equal to n+sod(n) for n = 30213896 and 30213905.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16453 + ... + 18196.

Almost surely, 2^30213928 is an apocalyptic number.

It is an amenable number.

30213928 is a deficient number, since it is larger than the sum of its proper divisors (26958572).

30213928 is a wasteful number, since it uses less digits than its factorization.

30213928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34764 (or 34760 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 30213928 is about 5496.7197490867. The cubic root of 30213928 is about 311.4600841856.

The spelling of 30213928 in words is "thirty million, two hundred thirteen thousand, nine hundred twenty-eight".