728686403 has 8 divisors (see below), whose sum is σ = 764943360. Its totient is φ = 693226440.

The previous prime is 728686397. The next prime is 728686411. The reversal of 728686403 is 304686827.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 728686403 - 2¹² = 728682307 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (728686493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 197375 + ... + 201032.

It is an arithmetic number, because the mean of its divisors is an integer number (95617920).

Almost surely, 2^728686403 is an apocalyptic number.

728686403 is a deficient number, since it is larger than the sum of its proper divisors (36256957).

728686403 is a wasteful number, since it uses less digits than its factorization.

728686403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 398497.

The product of its (nonzero) digits is 387072, while the sum is 44.

The square root of 728686403 is about 26994.1920234705. The cubic root of 728686403 is about 899.8709292272.

The spelling of 728686403 in words is "seven hundred twenty-eight million, six hundred eighty-six thousand, four hundred three".