30893728 has 12 divisors (see below), whose sum is σ = 60822090. Its totient is φ = 15446848.

The previous prime is 30893699. The next prime is 30893749. The reversal of 30893728 is 82739803.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 24482704 + 6411024 = 4948^2 + 2532^2 .

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 as a sum of consecutive naturals, namely, 482683 + ... + 482746.

Almost surely, 2^30893728 is an apocalyptic number.

It is an amenable number.

30893728 is a deficient number, since it is larger than the sum of its proper divisors (29928362).

30893728 is an equidigital number, since it uses as much as digits as its factorization.

30893728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 965439 (or 965431 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 40.

The square root of 30893728 is about 5558.2126623583. The cubic root of 30893728 is about 313.7786856520.

The spelling of 30893728 in words is "thirty million, eight hundred ninety-three thousand, seven hundred twenty-eight".