721736045228 has 48 divisors (see below), whose sum is σ = 1461578235264. Its totient is φ = 308199440640.

The previous prime is 721736045227. The next prime is 721736045297. The reversal of 721736045228 is 822540637127.

It is not an unprimeable number, because it can be changed into a prime (721736045227) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 472826 + ... + 1291137.

It is an arithmetic number, because the mean of its divisors is an integer number (30449546568).

Almost surely, 2^721736045228 is an apocalyptic number.

It is an amenable number.

721736045228 is an abundant number, since it is smaller than the sum of its proper divisors (739842190036).

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

721736045228 is a wasteful number, since it uses less digits than its factorization.

721736045228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1764542 (or 1764540 counting only the distinct ones).

The product of its (nonzero) digits is 1128960, while the sum is 47.

The spelling of 721736045228 in words is "seven hundred twenty-one billion, seven hundred thirty-six million, forty-five thousand, two hundred twenty-eight".