721384752 has 80 divisors (see below), whose sum is σ = 2040369408. Its totient is φ = 217808640.

The previous prime is 721384739. The next prime is 721384757. The reversal of 721384752 is 257483127.

It is a self number, because there is not a number n which added to its sum of digits gives 721384752.

It is not an unprimeable number, because it can be changed into a prime (721384757) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 152373 + ... + 157035.

Almost surely, 2^721384752 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 721384752, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1020184704).

721384752 is an abundant number, since it is smaller than the sum of its proper divisors (1318984656).

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

721384752 is a wasteful number, since it uses less digits than its factorization.

721384752 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4978 (or 4972 counting only the distinct ones).

The product of its digits is 94080, while the sum is 39.

The square root of 721384752 is about 26858.6066652758. The cubic root of 721384752 is about 896.8551770955.

The spelling of 721384752 in words is "seven hundred twenty-one million, three hundred eighty-four thousand, seven hundred fifty-two".