728999999 has 96 divisors (see below), whose sum is σ = 1041868800. Its totient is φ = 502951680.

The previous prime is 728999993. The next prime is 729000007. The reversal of 728999999 is 999999827.

It is a Cunningham number, because it is equal to 30⁶-1.

It is not a de Polignac number, because 728999999 - 2⁴ = 728999983 is a prime.

728999999 is a modest number, since divided by 99999 gives 7289 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (728999993) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 10880564 + ... + 10880630.

It is an arithmetic number, because the mean of its divisors is an integer number (10852800).

Almost surely, 2^728999999 is an apocalyptic number.

728999999 is a deficient number, since it is larger than the sum of its proper divisors (312868801).

728999999 is a wasteful number, since it uses less digits than its factorization.

728999999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173 (or 166 counting only the distinct ones).

The product of its digits is 59521392, while the sum is 71.

The square root of 728999999 is about 26999.9999814815. Note that the first 4 decimals coincide. The cubic root of 728999999 is about 899.9999995885. Note that the first 6 decimals are identical.

The spelling of 728999999 in words is "seven hundred twenty-eight million, nine hundred ninety-nine thousand, nine hundred ninety-nine".