721673352 has 96 divisors (see below), whose sum is σ = 2128464000. Its totient is φ = 220026240.

The previous prime is 721673339. The next prime is 721673353. The reversal of 721673352 is 253376127.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (721673353) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 30577 + ... + 48767.

It is an arithmetic number, because the mean of its divisors is an integer number (22171500).

Almost surely, 2^721673352 is an apocalyptic number.

721673352 is a gapful number since it is divisible by the number (72) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 721673352, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1064232000).

721673352 is an abundant number, since it is smaller than the sum of its proper divisors (1406790648).

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

721673352 is a wasteful number, since it uses less digits than its factorization.

721673352 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18251 (or 18244 counting only the distinct ones).

The product of its digits is 52920, while the sum is 36.

The square root of 721673352 is about 26863.9787075556. The cubic root of 721673352 is about 896.9747609443.

The spelling of 721673352 in words is "seven hundred twenty-one million, six hundred seventy-three thousand, three hundred fifty-two".