721845604 has 6 divisors (see below), whose sum is σ = 1263229814. Its totient is φ = 360922800.

The previous prime is 721845563. The next prime is 721845623. The reversal of 721845604 is 406548127.

721845604 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 718776100 + 3069504 = 26810^2 + 1752^2 .

It is a super-2 number, since 2×721845604² = 1042122152028249632, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90230697 + ... + 90230704.

Almost surely, 2^721845604 is an apocalyptic number.

It is an amenable number.

721845604 is a deficient number, since it is larger than the sum of its proper divisors (541384210).

721845604 is a wasteful number, since it uses less digits than its factorization.

721845604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180461405 (or 180461403 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 37.

The square root of 721845604 is about 26867.1845194095. The cubic root of 721845604 is about 897.0461198238.

The spelling of 721845604 in words is "seven hundred twenty-one million, eight hundred forty-five thousand, six hundred four".