728887801 has 4 divisors (see below), whose sum is σ = 771763572. Its totient is φ = 686012032.

The previous prime is 728887787. The next prime is 728887837. The reversal of 728887801 is 108788827.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 679957776 + 48930025 = 26076^2 + 6995^2 .

It is a cyclic number.

It is not a de Polignac number, because 728887801 - 2¹¹ = 728885753 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (728887001) 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 3 ways as a sum of consecutive naturals, for example, 21437860 + ... + 21437893.

It is an arithmetic number, because the mean of its divisors is an integer number (192940893).

Almost surely, 2^728887801 is an apocalyptic number.

It is an amenable number.

728887801 is a deficient number, since it is larger than the sum of its proper divisors (42875771).

728887801 is a wasteful number, since it uses less digits than its factorization.

728887801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42875770.

The product of its (nonzero) digits is 401408, while the sum is 49.

The square root of 728887801 is about 26997.9221607886. The cubic root of 728887801 is about 899.9538252030.

The spelling of 728887801 in words is "seven hundred twenty-eight million, eight hundred eighty-seven thousand, eight hundred one".