721436604 has 72 divisors (see below), whose sum is σ = 1961930880. Its totient is φ = 205730784.

The previous prime is 721436603. The next prime is 721436621. The reversal of 721436604 is 406634127.

It is a happy number.

721436604 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721436603) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 461977 + ... + 463535.

It is an arithmetic number, because the mean of its divisors is an integer number (27249040).

Almost surely, 2^721436604 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 721436604, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (980965440).

721436604 is an abundant number, since it is smaller than the sum of its proper divisors (1240494276).

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

721436604 is a wasteful number, since it uses less digits than its factorization.

721436604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2367 (or 2358 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 33.

The square root of 721436604 is about 26859.5719251071. The cubic root of 721436604 is about 896.8766647599.

The spelling of 721436604 in words is "seven hundred twenty-one million, four hundred thirty-six thousand, six hundred four".