721336604 has 24 divisors (see below), whose sum is σ = 1318568160. Its totient is φ = 344844864.

The previous prime is 721336591. The next prime is 721336607. The reversal of 721336604 is 406633127.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721336607) 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, 18239 + ... + 42134.

It is an arithmetic number, because the mean of its divisors is an integer number (54940340).

Almost surely, 2^721336604 is an apocalyptic number.

It is an amenable number.

721336604 is a deficient number, since it is larger than the sum of its proper divisors (597231556).

721336604 is a wasteful number, since it uses less digits than its factorization.

721336604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60509 (or 60507 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 32.

The square root of 721336604 is about 26857.7103268317. The cubic root of 721336604 is about 896.8352234606.

The spelling of 721336604 in words is "seven hundred twenty-one million, three hundred thirty-six thousand, six hundred four".