728421895 has 8 divisors (see below), whose sum is σ = 877431456. Its totient is φ = 580520736.

The previous prime is 728421893. The next prime is 728421901. The reversal of 728421895 is 598124827.

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 728421895 - 2¹ = 728421893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (728421893) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 275652 + ... + 278281.

It is an arithmetic number, because the mean of its divisors is an integer number (109678932).

Almost surely, 2^728421895 is an apocalyptic number.

728421895 is a deficient number, since it is larger than the sum of its proper divisors (149009561).

728421895 is a wasteful number, since it uses less digits than its factorization.

728421895 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 554201.

The product of its digits is 322560, while the sum is 46.

The square root of 728421895 is about 26989.2922285858. The cubic root of 728421895 is about 899.7620337935.

It can be divided in two parts, 728421 and 895, that added together give a square (729316 = 854²).

The spelling of 728421895 in words is "seven hundred twenty-eight million, four hundred twenty-one thousand, eight hundred ninety-five".