704521728 has 120 divisors (see below), whose sum is σ = 2077197408. Its totient is φ = 229773312.

The previous prime is 704521721. The next prime is 704521733. The reversal of 704521728 is 827125407.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 704521692 and 704521701.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (704521721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 214950 + ... + 218202.

Almost surely, 2^704521728 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 704521728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1038598704).

704521728 is an abundant number, since it is smaller than the sum of its proper divisors (1372675680).

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

704521728 is a wasteful number, since it uses less digits than its factorization.

704521728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3324 (or 3305 counting only the distinct ones).

The product of its (nonzero) digits is 31360, while the sum is 36.

The square root of 704521728 is about 26542.8281838993. The cubic root of 704521728 is about 889.8117381539.

The spelling of 704521728 in words is "seven hundred four million, five hundred twenty-one thousand, seven hundred twenty-eight".