728856427 has 8 divisors (see below), whose sum is σ = 785436176. Its totient is φ = 672350112.

The previous prime is 728856421. The next prime is 728856431. The reversal of 728856427 is 724658827.

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 728856427 - 2¹⁵ = 728823659 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (728856421) 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, 3208 + ... + 38314.

It is an arithmetic number, because the mean of its divisors is an integer number (98179522).

Almost surely, 2^728856427 is an apocalyptic number.

728856427 is a deficient number, since it is larger than the sum of its proper divisors (56579749).

728856427 is a wasteful number, since it uses less digits than its factorization.

728856427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36717.

The product of its digits is 1505280, while the sum is 49.

The square root of 728856427 is about 26997.3411098204. The cubic root of 728856427 is about 899.9409125817.

The spelling of 728856427 in words is "seven hundred twenty-eight million, eight hundred fifty-six thousand, four hundred twenty-seven".