728721900399 has 8 divisors (see below), whose sum is σ = 971634216880. Its totient is φ = 485812092096.

The previous prime is 728721900359. The next prime is 728721900461. The reversal of 728721900399 is 993009127827.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 728721900399 - 2¹² = 728721896303 is a prime.

It is a super-2 number, since 2×728721900399² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (728721900359) by changing a digit.

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, 210819 + ... + 1225515.

It is an arithmetic number, because the mean of its divisors is an integer number (121454277110).

Almost surely, 2^728721900399 is an apocalyptic number.

728721900399 is a deficient number, since it is larger than the sum of its proper divisors (242912316481).

728721900399 is a wasteful number, since it uses less digits than its factorization.

728721900399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1254089.

The product of its (nonzero) digits is 3429216, while the sum is 57.

The spelling of 728721900399 in words is "seven hundred twenty-eight billion, seven hundred twenty-one million, nine hundred thousand, three hundred ninety-nine".