728280387 has 6 divisors (see below), whose sum is σ = 1051960572. Its totient is φ = 485520252.

The previous prime is 728280359. The next prime is 728280409. The reversal of 728280387 is 783082827.

728280387 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 728280387 - 2⁸ = 728280131 is a prime.

It is not an unprimeable number, because it can be changed into a prime (728280307) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 40460013 + ... + 40460030.

It is an arithmetic number, because the mean of its divisors is an integer number (175326762).

Almost surely, 2^728280387 is an apocalyptic number.

728280387 is a deficient number, since it is larger than the sum of its proper divisors (323680185).

728280387 is a wasteful number, since it uses less digits than its factorization.

728280387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80920049 (or 80920046 counting only the distinct ones).

The product of its (nonzero) digits is 301056, while the sum is 45.

The square root of 728280387 is about 26986.6705430663. The cubic root of 728280387 is about 899.7037654682.

The spelling of 728280387 in words is "seven hundred twenty-eight million, two hundred eighty thousand, three hundred eighty-seven".