721134284 has 48 divisors (see below), whose sum is σ = 1440012000. Its totient is φ = 313238016.

The previous prime is 721134283. The next prime is 721134287. The reversal of 721134284 is 482431127.

It is a self number, because there is not a number n which added to its sum of digits gives 721134284.

It is not an unprimeable number, because it can be changed into a prime (721134283) 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 15 ways as a sum of consecutive naturals, for example, 152792 + ... + 157440.

It is an arithmetic number, because the mean of its divisors is an integer number (30000250).

Almost surely, 2^721134284 is an apocalyptic number.

It is an amenable number.

721134284 is a deficient number, since it is larger than the sum of its proper divisors (718877716).

721134284 is a wasteful number, since it uses less digits than its factorization.

721134284 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4842 (or 4840 counting only the distinct ones).

The product of its digits is 10752, while the sum is 32.

The square root of 721134284 is about 26853.9435465259. The cubic root of 721134284 is about 896.7513677091.

The spelling of 721134284 in words is "seven hundred twenty-one million, one hundred thirty-four thousand, two hundred eighty-four".