721652064 has 96 divisors (see below), whose sum is σ = 2187472896. Its totient is φ = 204042240.

The previous prime is 721652017. The next prime is 721652119. The reversal of 721652064 is 460256127.

It is a tau number, because it is divible by the number of its divisors (96).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 59649 + ... + 70719.

It is an arithmetic number, because the mean of its divisors is an integer number (22786176).

Almost surely, 2^721652064 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 721652064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1093736448).

721652064 is an abundant number, since it is smaller than the sum of its proper divisors (1465820832).

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

721652064 is a wasteful number, since it uses less digits than its factorization.

721652064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11188 (or 11180 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 33.

The square root of 721652064 is about 26863.5824863327. The cubic root of 721652064 is about 896.9659411708.

The spelling of 721652064 in words is "seven hundred twenty-one million, six hundred fifty-two thousand, sixty-four".