721283472 has 240 divisors, whose sum is σ = 2616082560. Its totient is φ = 180154368.

The previous prime is 721283471. The next prime is 721283483. The reversal of 721283472 is 274382127.

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

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (721283471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 247528 + ... + 250424.

It is an arithmetic number, because the mean of its divisors is an integer number (10900344).

Almost surely, 2^721283472 is an apocalyptic number.

721283472 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 721283472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1308041280).

721283472 is an abundant number, since it is smaller than the sum of its proper divisors (1894799088).

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

721283472 is a wasteful number, since it uses less digits than its factorization.

721283472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2950 (or 2941 counting only the distinct ones).

The product of its digits is 37632, while the sum is 36.

The square root of 721283472 is about 26856.7211699418. The cubic root of 721283472 is about 896.8132033114.

The spelling of 721283472 in words is "seven hundred twenty-one million, two hundred eighty-three thousand, four hundred seventy-two".