721523227336 has 32 divisors (see below), whose sum is σ = 1386283764600. Its totient is φ = 351853032960.

The previous prime is 721523227333. The next prime is 721523227427. The reversal of 721523227336 is 633722325127.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 345619355236 + 375903872100 = 587894^2 + 613110^2 .

It is a junction number, because it is equal to n+sod(n) for n = 721523227292 and 721523227301.

It is not an unprimeable number, because it can be changed into a prime (721523227333) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 718486 + ... + 1399738.

Almost surely, 2^721523227336 is an apocalyptic number.

It is an amenable number.

721523227336 is a deficient number, since it is larger than the sum of its proper divisors (664760537264).

721523227336 is a wasteful number, since it uses less digits than its factorization.

721523227336 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 684529 (or 684525 counting only the distinct ones).

The product of its digits is 635040, while the sum is 43.

The spelling of 721523227336 in words is "seven hundred twenty-one billion, five hundred twenty-three million, two hundred twenty-seven thousand, three hundred thirty-six".