728868825 has 18 divisors (see below), whose sum is σ = 1305485454. Its totient is φ = 388729920.

The previous prime is 728868821. The next prime is 728868839. The reversal of 728868825 is 528868827.

It can be written as a sum of positive squares in 3 ways, for example, as 101666889 + 627201936 = 10083^2 + 25044^2 .

It is not a de Polignac number, because 728868825 - 2² = 728868821 is a prime.

It is not an unprimeable number, because it can be changed into a prime (728868821) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1619484 + ... + 1619933.

Almost surely, 2^728868825 is an apocalyptic number.

728868825 is a gapful number since it is divisible by the number (75) formed by its first and last digit.

It is an amenable number.

728868825 is a deficient number, since it is larger than the sum of its proper divisors (576616629).

728868825 is a wasteful number, since it uses less digits than its factorization.

728868825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3239433 (or 3239425 counting only the distinct ones).

The product of its digits is 3440640, while the sum is 54.

The square root of 728868825 is about 26997.5707240485. The cubic root of 728868825 is about 899.9460152804.

The spelling of 728868825 in words is "seven hundred twenty-eight million, eight hundred sixty-eight thousand, eight hundred twenty-five".