698221728 has 96 divisors (see below), whose sum is σ = 2143713600. Its totient is φ = 220485888.

The previous prime is 698221721. The next prime is 698221729. The reversal of 698221728 is 827122896.

It is a tau number, because it is divible by the number of its divisors (96).

It is not an unprimeable number, because it can be changed into a prime (698221721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4851 + ... + 37682.

It is an arithmetic number, because the mean of its divisors is an integer number (22330350).

Almost surely, 2^698221728 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 698221728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1071856800).

698221728 is an abundant number, since it is smaller than the sum of its proper divisors (1445491872).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

698221728 is a wasteful number, since it uses less digits than its factorization.

698221728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42571 (or 42557 counting only the distinct ones).

The product of its digits is 193536, while the sum is 45.

The square root of 698221728 is about 26423.8855583353. The cubic root of 698221728 is about 887.1514904325.

The spelling of 698221728 in words is "six hundred ninety-eight million, two hundred twenty-one thousand, seven hundred twenty-eight".