728880813 has 12 divisors (see below), whose sum is σ = 1061119488. Its totient is φ = 482093640.

The previous prime is 728880811. The next prime is 728880853. The reversal of 728880813 is 318088827.

It is a happy number.

It is not a de Polignac number, because 728880813 - 2¹ = 728880811 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (728880811) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 317703 + ... + 319988.

It is an arithmetic number, because the mean of its divisors is an integer number (88426624).

Almost surely, 2^728880813 is an apocalyptic number.

It is an amenable number.

728880813 is a deficient number, since it is larger than the sum of its proper divisors (332238675).

728880813 is a wasteful number, since it uses less digits than its factorization.

728880813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 637824 (or 637821 counting only the distinct ones).

The product of its (nonzero) digits is 172032, while the sum is 45.

The square root of 728880813 is about 26997.7927431114. The cubic root of 728880813 is about 899.9509491786.

The spelling of 728880813 in words is "seven hundred twenty-eight million, eight hundred eighty thousand, eight hundred thirteen".