721586428728 has 64 divisors (see below), whose sum is σ = 1968857884800. Its totient is φ = 218563121280.

The previous prime is 721586428709. The next prime is 721586428751. The reversal of 721586428728 is 827824685127.

It is a congruent number.

It is an unprimeable number.

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, 38763 + ... + 1201946.

It is an arithmetic number, because the mean of its divisors is an integer number (30763404450).

Almost surely, 2^721586428728 is an apocalyptic number.

It is an amenable number.

721586428728 is an abundant number, since it is smaller than the sum of its proper divisors (1247271456072).

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

721586428728 is a wasteful number, since it uses less digits than its factorization.

721586428728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1242932 (or 1242928 counting only the distinct ones).

The product of its digits is 24084480, while the sum is 60.

The spelling of 721586428728 in words is "seven hundred twenty-one billion, five hundred eighty-six million, four hundred twenty-eight thousand, seven hundred twenty-eight".