721272343520 has 48 divisors (see below), whose sum is σ = 1714859512128. Its totient is φ = 286671290880.

The previous prime is 721272343501. The next prime is 721272343543. The reversal of 721272343520 is 25343272127.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14331416 + ... + 14381655.

It is an arithmetic number, because the mean of its divisors is an integer number (35726239836).

Almost surely, 2^721272343520 is an apocalyptic number.

It is an amenable number.

721272343520 is an abundant number, since it is smaller than the sum of its proper divisors (993587168608).

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

721272343520 is a wasteful number, since it uses less digits than its factorization.

721272343520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28713243 (or 28713235 counting only the distinct ones).

The product of its (nonzero) digits is 141120, while the sum is 38.

The spelling of 721272343520 in words is "seven hundred twenty-one billion, two hundred seventy-two million, three hundred forty-three thousand, five hundred twenty".