728999999989 has 2 divisors, whose sum is σ = 728999999990. Its totient is φ = 728999999988.

The previous prime is 728999999947. The next prime is 729000000019. The reversal of 728999999989 is 989999999827.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 615958128900 + 113041871089 = 784830^2 + 336217^2 .

It is a cyclic number.

It is not a de Polignac number, because 728999999989 - 2¹⁷ = 728999868917 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 728999999989.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (728999997989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 364499999994 + 364499999995.

It is an arithmetic number, because the mean of its divisors is an integer number (364499999995).

Almost surely, 2^728999999989 is an apocalyptic number.

It is an amenable number.

728999999989 is a deficient number, since it is larger than the sum of its proper divisors (1).

728999999989 is an equidigital number, since it uses as much as digits as its factorization.

728999999989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 38569862016, while the sum is 97.

The spelling of 728999999989 in words is "seven hundred twenty-eight billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred eighty-nine".