30818728 has 8 divisors (see below), whose sum is σ = 57785130. Its totient is φ = 15409360.

The previous prime is 30818719. The next prime is 30818761. The reversal of 30818728 is 82781803.

It can be written as a sum of positive squares in only one way, i.e., 18301284 + 12517444 = 4278^2 + 3538^2 .

It is a tau number, because it is divible by the number of its divisors (8).

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 as a sum of consecutive naturals, namely, 1926163 + ... + 1926178.

Almost surely, 2^30818728 is an apocalyptic number.

It is an amenable number.

30818728 is a deficient number, since it is larger than the sum of its proper divisors (26966402).

30818728 is a wasteful number, since it uses less digits than its factorization.

30818728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3852347 (or 3852343 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 37.

The square root of 30818728 is about 5551.4617894749. The cubic root of 30818728 is about 313.5245621075.

The spelling of 30818728 in words is "thirty million, eight hundred eighteen thousand, seven hundred twenty-eight".