728280388 has 12 divisors (see below), whose sum is σ = 1390353552. Its totient is φ = 331036520.

The previous prime is 728280359. The next prime is 728280409. The reversal of 728280388 is 883082827.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8275870 + ... + 8275957.

It is an arithmetic number, because the mean of its divisors is an integer number (115862796).

Almost surely, 2^728280388 is an apocalyptic number.

It is an amenable number.

728280388 is a deficient number, since it is larger than the sum of its proper divisors (662073164).

728280388 is a wasteful number, since it uses less digits than its factorization.

728280388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16551842 (or 16551840 counting only the distinct ones).

The product of its (nonzero) digits is 344064, while the sum is 46.

The square root of 728280388 is about 26986.6705615939. The cubic root of 728280388 is about 899.7037658800.

The spelling of 728280388 in words is "seven hundred twenty-eight million, two hundred eighty thousand, three hundred eighty-eight".