728999999999 has 4 divisors (see below), whose sum is σ = 729081018000. Its totient is φ = 728918982000.

The previous prime is 728999999989. The next prime is 729000000019. The reversal of 728999999999 is 999999999827.

It is a Cunningham number, because it is equal to 9000³-1.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 728999999999 - 2⁸ = 728999999743 is a prime.

It is a Duffinian number.

728999999999 is a modest number, since divided by 999999 gives 728999 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (728999999989) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40495502 + ... + 40513499.

It is an arithmetic number, because the mean of its divisors is an integer number (182270254500).

Almost surely, 2^728999999999 is an apocalyptic number.

728999999999 is a deficient number, since it is larger than the sum of its proper divisors (81018001).

728999999999 is an equidigital number, since it uses as much as digits as its factorization.

728999999999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81018000.

The product of its digits is 43391094768, while the sum is 98.

The spelling of 728999999999 in words is "seven hundred twenty-eight billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred ninety-nine".