721668288 has 112 divisors (see below), whose sum is σ = 2095073280. Its totient is φ = 217420800.

The previous prime is 721668253. The next prime is 721668293. The reversal of 721668288 is 882866127.

It is a Harshad number since it is a multiple of its sum of digits (48).

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, 402498 + ... + 404286.

Almost surely, 2^721668288 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 721668288, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1047536640).

721668288 is an abundant number, since it is smaller than the sum of its proper divisors (1373404992).

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

721668288 is a wasteful number, since it uses less digits than its factorization.

721668288 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2006 (or 1996 counting only the distinct ones).

The product of its digits is 516096, while the sum is 48.

The square root of 721668288 is about 26863.8844547843. The cubic root of 721668288 is about 896.9726629079.

The spelling of 721668288 in words is "seven hundred twenty-one million, six hundred sixty-eight thousand, two hundred eighty-eight".