721435064 has 32 divisors (see below), whose sum is σ = 1547532000. Its totient is φ = 308866560.

The previous prime is 721435063. The next prime is 721435081. The reversal of 721435064 is 460534127.

It is a self number, because there is not a number n which added to its sum of digits gives 721435064.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721435061) 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, 52604 + ... + 64884.

It is an arithmetic number, because the mean of its divisors is an integer number (48360375).

Almost surely, 2^721435064 is an apocalyptic number.

It is an amenable number.

721435064 is an abundant number, since it is smaller than the sum of its proper divisors (826096936).

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

721435064 is a wasteful number, since it uses less digits than its factorization.

721435064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13343 (or 13339 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 32.

The square root of 721435064 is about 26859.5432574718. The cubic root of 721435064 is about 896.8760265930.

The spelling of 721435064 in words is "seven hundred twenty-one million, four hundred thirty-five thousand, sixty-four".